JP4258363B2 - Refrigeration air conditioner, operation method of refrigeration air conditioner - Google Patents

Description

  The present invention relates to a refrigeration air conditioner used in a store such as a convenience store.

  A conventional refrigeration apparatus is connected to a showcase or a refrigerator installed in a store, and is provided completely independently of an air conditioner that performs air conditioning in the store. Further, Patent Document 1 discloses a refrigeration air-conditioning apparatus that includes a plurality of compressors and is configured by one refrigeration cycle that circulates the same refrigerant for air conditioning, refrigeration, and refrigeration.

  In addition, the third heat exchanger is configured so that the refrigerant having two independent flow paths each including a compressor, a condenser, and an evaporator exchange heat with each other through the flow path. This is shown in Patent Document 2. Also, it has two independent flow paths each equipped with a compressor and one heat exchanger, and each refrigerant exchanges heat with the surrounding air while exchanging heat with a third heat exchanger. It is shown in Reference 3.

Japanese Patent Laid-Open No. 2002-357367 (FIG. 1) Japanese Unexamined Patent Publication No. 2003-4321 (FIG. 1) JP 2001-289532 A (FIG. 12)

  Conventional refrigeration and air-conditioning apparatuses are operated in a refrigeration cycle in which air conditioning, refrigeration, and refrigeration are completely independent, and there is a problem that energy saving is not achieved by effective use of heat. Further, in the case of enhancing facilities such as air conditioning, refrigeration, and refrigeration, there is a problem that additional independent refrigeration cycles are added and there are restrictions on space and cost.

  In addition, the conventional refrigeration and air-conditioning apparatus disclosed in Patent Document 1 has a problem in that risk dispersion is not performed because air-conditioning, refrigeration, and refrigeration are configured by one refrigeration cycle. In other words, if the compressor, expansion valve, or other components that make up the refrigeration cycle are broken, the refrigeration cycle is stopped during repair even if multiple compressors are installed. In other words, if the system is independent, it becomes impossible to maintain the cooling of the frozen food and fresh food in the showcase in the store that should not be affected. Furthermore, there was a problem that the facility could not be expanded.

  In addition, since the same refrigerant is circulated through one heat exchanger on the heat source side, an effect of improving the efficiency can be obtained only at a specific time when heating is fully operated. However, when operating specially such as defrost, there is a problem that wasteful loss is large, the refrigeration side refrigeration effect (cooling capacity) is affected by the air conditioning side, and if the high pressure becomes high, the refrigeration side refrigeration There was a problem that the effect was small and sufficient cooling capacity could not be obtained.

  In the configuration shown in Patent Document 2, the air-conditioning side refrigeration cycle and the refrigerator-side refrigeration cycle can be operated independently, and there is no problem as in Patent Document 1, but the exhaust heat of the refrigerator is recovered during air-conditioner heating. Since the heat exchanger which performs is provided, there exists a problem that cost is high and an extra space is needed. In the configuration shown in Patent Document 3, there is no problem that the same refrigerant is used, and there is no problem that the number of heat exchangers increases, but the heat exchangers on the heat source side always exchange heat with each other, and the heating time Other than the above, there was a problem that the effect of the combination could not be obtained. There was also a problem that the facility could not be expanded easily.

  An object of the present invention is to obtain a refrigerating and air-conditioning apparatus that can stably operate and reduce energy with a simple apparatus having a small space. Another object of the present invention is to provide a refrigerating and air-conditioning apparatus capable of operating without waste of energy in any operation state and a method thereof. Another object of the present invention is to obtain a device that can change equipment with a simple structure at a low cost with respect to an existing machine and can reduce energy when the equipment is changed.

The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And a first passage connected to the first heat exchanger and a second passage connected to the second heat exchanger. Circulates the second refrigerant by connecting the third heat exchanger that is integrally provided so as to exchange heat with each other, the second heat exchanger, and the second flow path of the third heat exchanger. A flow path for adjusting the flow rate of the refrigerant that is provided in the second refrigeration cycle and that allows a part or all of the second refrigerant to bypass the third heat exchanger and is connected to the bypass flow dew. A mixed refrigerant containing gas refrigerant from the path control means, the second flow path and the bypass flow path of the third heat exchanger with a supercooling heat exchanger A supercooling unit which is provided in the second refrigeration cycle for storing the turned into liquid reservoir is those with.

The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And each of the first flow path connected to the first heat exchanger and the second flow path connected to the second heat exchanger have independent flow paths and pass through the flow paths. A third heat exchanger provided integrally so that the refrigerant exchanges heat with each other, and a first heat exchanger and a first flow path of the third heat exchanger are connected by a pipe to form a first heat exchanger. The first refrigeration cycle for circulating the first refrigerant in the compressor, the second heat exchanger, and the second flow path of the third heat exchanger are connected by a pipe, and the second compressor A second refrigeration cycle for circulating the second refrigerant, and an evaporation temperature of the first refrigerant when the first refrigerant is evaporated in the first flow path of the third heat exchanger and the first Heat exchange with other refrigerants That the third and the second condensation temperature of the refrigerant flowing through the heat exchanger, in which close by decreasing the air volume of the blower fan for blowing air to the third heat exchanger.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And a first flow path having a first compressor connected to the first heat exchanger and a second flow path having a second compressor connected to the second heat exchanger. A third heat exchanger that can exchange heat with each other through the flow path, and a blower that adjusts the amount of heat exchange between the third heat exchanger and ambient air. A predetermined air-conditioning operation by driving and a predetermined refrigeration or freezing operation by driving the second compressor are performed, and the air flow rate of the blower is changed in a direction to reduce both compressor inputs.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And the refrigerant passing through the independent flow paths of the first flow path connected to the first heat exchanger and the second flow path connected to the second heat exchanger can exchange heat directly with each other. Auxiliary having a third heat exchanger and a blower connected to at least one of the first flow path and the second flow path and provided in parallel with the third heat exchanger to adjust the amount of heat exchange with ambient air And a heat exchanger.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs indoor air-conditioning on the load side of a plurality of first refrigeration cycles that are circulated through a refrigerant, and a first refrigerant that is circulated through a second refrigerant. A second heat exchanger provided in a second refrigeration cycle independent of the refrigeration cycle and performing refrigeration or freezing on the load side; and a first refrigerant passing through at least one refrigeration cycle among the plurality of first refrigeration cycles A first refrigerant cycle that does not exchange heat with the third heat exchanger during cooling, the second refrigerant passing through the second refrigeration cycle and a third heat exchanger that exchanges heat on the heat source side Priority is given to the operation that performs the flow of the refrigerant to the flow path of the refrigerant, and priority is given to the operation that performs the flow of the refrigerant to the flow path of the first refrigeration cycle that exchanges heat with the third heat exchanger during heating. is there.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And a third heat exchanger provided integrally with the first and second flow paths, each having independent flow paths, and the refrigerant passing through the flow paths exchange heat with each other; A first refrigeration cycle in which the first heat exchanger and the first flow path of the third heat exchanger are connected by piping, and the second of the second heat exchanger and the third heat exchanger. A part of or all of the refrigerant that is connected to at least one of the second refrigeration cycle and the first and second refrigeration cycles and that flows through the refrigeration cycle. And a refrigerant that is provided in at least one of the first and second refrigeration cycles and flows to the bypass channel And the flow path control means for adjusting the amount, those having a.

  The operation method of the refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that is provided in a first refrigeration cycle in which refrigerant is circulated and performs indoor air conditioning, and a first refrigeration cycle in which a second refrigerant is circulated. And a second heat exchanger that is provided in a second refrigeration cycle independent of each other and performs refrigeration or freezing, and a refrigerant that passes through the first refrigeration cycle exchanges heat with a second refrigerant that passes through the flow path of the second refrigeration cycle. A third heat exchanger, a compressor in the first refrigeration cycle and the second refrigeration cycle, etc., and at least operating the compressor etc. in the operation of the first and second refrigeration cycles or adjusting the rotation speed Operating condition adjusting means, and adjusting the operating condition adjusting means to perform air conditioning operation in the first refrigeration cycle and refrigeration or refrigeration operation in the second refrigeration cycle. Steps to do and Adjusting the amount of heat exchange of the third heat exchanger by a blower provided in the third heat exchanger, and bypassing the refrigerant to the third heat exchanger provided in the second refrigeration cycle, or And continuing the refrigeration or freezing by stopping the refrigerant circulating in the second refrigeration cycle for a short time.

  The refrigerating and air-conditioning apparatus of the present invention has a small space, a simple apparatus, and an apparatus that can reduce energy. In addition, the present invention provides a refrigeration air conditioner and method that can perform stable control in any operating state and can operate without waste of energy. In addition, the present invention can provide an easy-to-use apparatus such as flexible equipment change, and can perform an operation method with less energy in any situation.

Embodiment 1 FIG.
FIG. 1 is a connection diagram of air-conditioning / refrigeration equipment in a store such as a convenience store. A plurality of air-conditioning indoor units 12 and a plurality of refrigeration showcases 13 are arranged in the store 14, and the air-conditioning indoor unit 12 is an air-conditioning outdoor unit 10. The refrigeration showcase 13 is connected to the refrigeration / air conditioning integrated unit 11 and the refrigeration / air conditioning integrated unit 11. In FIG. 1, an example in which there are two air conditioning indoor units 12b connected to the air conditioning outdoor unit 10 and one air conditioning indoor unit 12a connected to the refrigerated air conditioning integrated unit 11 has been described. It does not matter. While food and beverages are constantly refrigerated and frozen in the refrigerated showcase 13, the air conditioner cools and heats the room according to the outside air temperature.

  FIG. 2 is a refrigerant circuit diagram of a refrigeration / air conditioning integrated machine with a configuration of a refrigeration cycle in which an outdoor heat exchanger that is a heat source connected to the refrigeration or refrigeration showcase of FIG. 1 is integrated. In this circuit, there are two independent refrigerant circuits, a refrigerant circuit for air conditioning and a refrigerant circuit for refrigeration, both of which are connected to the integrated heat exchanger 42, where the two refrigerants are not mixed and heat exchange is performed. It is configured to Although FIG. 2 also illustrates an example of an indoor unit for air conditioning, it is a matter of course that a plurality of indoor units may be used. In the refrigerant circuit for air conditioning, the high-temperature and high-pressure refrigerant discharged from the compressor 21a during heating is condensed in the indoor heat exchanger 22a and exchanges heat with room air to warm the room. The refrigerant condensed in the refrigerator is expanded by the expansion means 23a, is evaporated by exchanging heat with the outside air by the blower fan 25c in the flow path 24a of the integrated heat exchanger 42, and is again sucked into the compressor. In the case of cooling, the four-way valve 31 is switched and the refrigerant flows in the reverse direction, and the integrated heat exchanger 42 serves as a condenser.

  The operation of the air conditioning refrigerant circuit will be described. The refrigerant that has been compressed by the air-conditioning compressor 21a to high temperature and pressure can be switched by the four-way valve 31 in the heating operation and the cooling operation. In the case of heating operation, the refrigerant passes through the four-way valve 31, and is then sent to the air conditioning indoor heat exchanger 22a to condense and expand in the air conditioning expansion valve 23a to become a low-temperature and low-pressure refrigerant. While passing through the air conditioning flow path 24a at 42, the refrigerant is evaporated by exchanging heat with the refrigeration-side refrigerant flowing through the inside of the refrigeration flow path 24b and the surrounding air via the heat radiation fins 41, and air-conditioning through the four-way valve 31. Return to the compressor 21a. In the case of cooling operation, the refrigerant passes through the four-way valve 31 and then is sent to the integrated heat exchanger 42 to exchange heat with the surrounding air through the radiation fins 41 while passing through the air conditioning channel 24a. The air-conditioning expansion valve 23a expands into a low-temperature and low-pressure refrigerant, evaporates in the air-conditioning indoor heat exchanger 22a, passes through the four-way valve 31, and returns to the air-conditioning compressor 21a.

  Next, the operation of the refrigeration refrigerant circuit will be described. The refrigerant compressed to high temperature and high pressure by the refrigeration compressor 21b is sent to the integrated heat exchanger 42 via the high pressure maintaining means 32, and is surrounded by the radiating fins 41 while passing through the refrigeration flow path 24b. Heat exchanges with air to condense, passes through the supercooling means 33 and the liquid reservoir 26, expands in the refrigeration expansion valve 23b, becomes a low-temperature and low-pressure refrigerant, and evaporates in the refrigeration room (showcase) heat exchanger 22b. And it returns to the compressor 21b for refrigeration. When the air-conditioning side refrigerant circuit is performing a cooling operation, that is, when the air-conditioning side refrigerant circuit is configured so that the low-temperature and low-pressure refrigerant flows through the air-conditioning refrigerant flow path 24a in the integrated heat exchanger 42. In the integrated heat exchanger 42, the refrigeration side refrigerant exchanges heat with the air conditioning side refrigerant flowing through the air conditioning flow path 24a in addition to heat exchange with the surrounding air.

  The air conditioner indoor heat exchanger 22 a is provided with an air conditioner indoor heat exchanger fan 25 a and plays a role of mainly blowing heating air into the room 14. The indoor heat exchanger or the like may be embedded in the ceiling, wall-mounted, or floor-mounted as shown in FIG. The air-conditioning expansion means 23a is provided indoors, that is, in the ceiling, but may be provided on the heat source side in some cases. The indoor heat exchanger 22b for refrigeration or freezing, which is at a lower temperature than the air conditioning, is housed together with the expansion means 23b in a showcase or a refrigerating apparatus arranged indoors. In the refrigeration and air conditioning integrated machine 11 installed outdoors, the air conditioning flow path 24a and the refrigeration or refrigeration flow path 24b are thermally integrated together by heat radiation fins for an integrated heat exchanger to form independent flow paths. It is an integrated heat exchanger. As a result, the refrigerant flowing through each flow path is separate, but mutual heat exchange is possible by transferring heat through the fins. Further, the blower fan 25c rotates between the fins 41 of the integrated heat exchanger 42 to blow the outside air, thereby enabling heat exchange between the outside air and the refrigerant flowing in each flow path.

  In addition, the refrigeration / air conditioning integrated machine 11 which is a heat source device of the air conditioner and the refrigeration machine includes an air conditioner compressor 21a, a refrigeration or refrigeration compressor 21b, a four-way valve 31 for switching the air conditioner to a cooling and heating flow path, and refrigeration. Alternatively, a bypass flow path 24c that bypasses the heat source side heat exchanger 42 flow path 24b of the refrigeration side refrigeration cycle and causes the refrigerant to flow or not flow to the flow path 24b, and the compressor 21b transfers the flow to the bypass flow path 24c. High pressure maintaining means or flow path control means 32 adjusted by the pressure value of the refrigerant to be discharged, supercooling refrigerant flow path 24d provided for performing supercooling control of the refrigeration or refrigeration side refrigeration cycle, and supercooling heat exchanger 22c The supercooling expansion means 23c for adjusting the amount of refrigerant in the supercooling refrigerant flow path 24d, the liquid reservoir 26 for accumulating excess refrigerant, etc. are stored separately in one box for air conditioning and refrigeration or freezing. HaveAlternatively, the box for air conditioning and the refrigerator or refrigeration are separated, and the box including the components of the integrated heat exchanger 42 as the third heat exchanger is made independent, and the three boxes are integrated later. You may combine. In such a case, if a configuration in which piping and wiring between the box bodies are connected outside each box body, not only the assembly and maintenance are simplified, but also the expansion and change of equipment can be easily dealt with.

  1 and 2 show examples of two showcases, a refrigeration apparatus that is a showcase and a refrigeration apparatus that requires a lower temperature evaporator may be used, or one or three or more may be used. Absent. The bypass flow path 24c that bypasses the heat source side heat exchanger of the refrigeration or refrigeration apparatus controls the operation of the refrigeration cycle, that is, adjusts the refrigerant flowing through the flow path to adjust the temperature of the refrigeration or freezing indoor heat exchanger 22b. Thus, the expansion means 23b being operated is operated normally, and the operation of the refrigeration cycle is smoothly performed. The expansion means 23b does not operate without an appropriate differential pressure, and the refrigeration or freezing apparatus does not operate. In mid-winter, if the outside air becomes a low temperature when the air conditioner is heated, the discharge pressure of the compressor of the refrigerator for refrigeration becomes low, and the differential pressure of the expansion means 23b cannot be secured. The refrigerant quantity to the flow path 24b of the condenser 42 is bypassed and reduced so as to obtain the minimum pressure that can secure this differential pressure. Therefore, since the temperature control with high accuracy by the expansion means 23b can be maintained by adjusting the opening degree of the high pressure maintenance means 32 that maintains the minimum pressure as the flow path control means, A practical and effective apparatus capable of adjusting the temperature of the apparatus while maintaining the high efficiency of the integrated refrigeration apparatus can be obtained. For example, when the air-conditioning side refrigeration cycle in the winter season is performing heating operation, energy consumption can be reduced by heat recovery. Further, when the air conditioning side refrigeration cycle in the intermediate period is stopped or performing weak operation, the heat radiating fins 41 of the integrated heat exchanger 42 can be used for heat dissipation of the refrigerant in the refrigeration side flow path 24b, so that heat transfer of the refrigeration side refrigeration cycle The area is expanded and energy is saved. Further, since the fan 25c can be optimized in accordance with the operation state, there is no waste of energy. Further, since the supercooling circuit is provided in the refrigeration side refrigeration cycle, the refrigerant flowing into the liquid reservoir 26 can be liquefied, and the operation can be prevented from becoming unstable.

  The difference in operation between the case of air conditioning and refrigeration alone and the integrated machine will be described with reference to the Mollier diagram shown in FIG. 3 for the case where the air conditioner is performing heating operation. In the following description, it is assumed that the air temperature in the store is about 20 ° C., the outside air temperature is about 10 ° C., and the air temperature in the showcase is about 5 ° C. Also, R410A is used for the refrigerant flowing in the piping of the air conditioner and the refrigerator for refrigeration, and the saturation pressure of the refrigerant was issued on May 26, 1998 by the Japan Society of Refrigerating and Air Conditioning. It was calculated based on Thermodynamic Properties of Pure and Blended Hydrofluorocarbon (HFC) Refrigerants.

  In the air conditioner, the condensation temperature (CT) of the refrigerant flowing in the indoor heat exchanger 22a during heating operation is about 50 ° C. to ensure a sufficient temperature difference from the store air temperature, and the refrigerant flowing in the outdoor heat exchanger 24a is evaporated. The temperature (ET) is about −6 ° C. to ensure a sufficient temperature difference from the outside air temperature. At this time, the high pressure and the low pressure of the air conditioning compressor 21a are obtained as the saturation pressure of the condensation temperature and the evaporation temperature, respectively, and become a high pressure of 3.0535 MPa and a low pressure of 0.65558 MPa. Accordingly, the compression ratio, which is the ratio between the high pressure and the low pressure of the compressor, is determined by the ratio of 3.0535 MPa and low pressure 0.655558 MPa and is 4.66.

  In the refrigerator for refrigeration, the condensation temperature (CT) of the refrigerant flowing in the outdoor heat exchanger 24b is about 30 ° C. to ensure a sufficient temperature difference from the outside air temperature, and the refrigerant flowing in the showcase heat exchanger 22b. The evaporating temperature (ET) is about −10 ° C. to ensure a sufficient temperature difference from the air temperature in the showcase. At this time, the high pressure and the low pressure of the refrigeration compressor 21b are obtained as the saturation pressure of the condensation temperature and the evaporation temperature, respectively, and become a high pressure of 1.8797 MPa and a low pressure of 0.57228 MPa. The compression ratio is determined by the ratio of 1.8797 MPa and 0.57228 MPa and is 3.28.

  On the other hand, in the refrigerated air conditioning integrated machine, when the air conditioning side circuit performs the heating operation, the condensation temperature (CT) of the refrigerant flowing in the indoor heat exchanger 22a is 50 ° C. in order to ensure a sufficient temperature difference from the store air temperature. It will be about. In the refrigerator for refrigeration, the evaporation temperature (ET) of the refrigerant flowing through the heat exchanger 22b in the showcase is about −10 ° C. in order to secure a sufficient temperature difference from the air temperature in the showcase.

  Further, since the air-conditioning-side refrigerant flowing in the air-conditioning flow path 24a of the integrated outdoor heat exchanger 42 and the refrigeration-side refrigerant flowing in the refrigeration side circuit 24b perform heat exchange, the evaporation temperature (ET1) of the refrigerant flowing in the 24a ) Is determined by the condensation temperature (CT2) of the refrigeration-side refrigerant flowing in 24b and the heat exchange performance between 24a and 24b. If the heat exchange performance between 24a and 24b is larger than that of the air-cooled heat exchanger in the case of a single unit, the temperature difference between ET1 and CT2 will be closer than in the case of a single unit. Suppose CT2 reaches 26 ° C. Then, the high pressure and the low pressure of the air conditioning side compressor 21b are obtained as the saturation pressure of the condensation temperature CT1 and the evaporation temperature ET1, respectively, and the high pressure Pd1 = 3.0535 MPa, the low pressure Ps1 = 0.90396 MPa, and the compression ratio Pd1 / Ps1 = 3.38. Become. Further, the high pressure and low pressure of the refrigeration compressor 21b are obtained as saturation pressures of the condensation temperature CT2 and the evaporation temperature ET2, respectively, and high pressure Pd2 = 1.6935 MPa, low pressure Ps2 = 0.572228 MPa, compression ratio Pd2 / Ps2 = 2.966. Become.

  At this time, the compression ratio 3.38 of the air-conditioning side compressor is 27% compared to the compression ratio 4.66 in the case of the single unit, and the compression ratio 2.96 of the refrigeration side compressor is compared to the compression ratio of 3.28 in the case of the single unit. The value is 10% smaller. The input of the compressor depends on the compression ratio and the refrigerant flow rate. If the refrigerant flow rate is the same, the smaller the compression ratio, the less the input. Therefore, if the integrated heat exchanger 42 is designed to a specification that can realize the pressure relationship shown here, the refrigeration and air conditioning integrated machine can save 27% on the air conditioning side and 10% on the refrigeration side. If the compression ratio, that is, the enthalpy difference between the refrigerant before and after the compressor is reduced, the work of the compressor is enthalpy difference × refrigerant flow rate, and the input becomes smaller and the energy can be reduced.

  As described above, when the amount of heat exchange between the air conditioning side and the refrigeration side is large, the low pressure on the air conditioning side increases and the high pressure on the refrigeration side decreases. However, if the refrigeration-side high pressure is too low, a pressure difference before and after the expansion means 23b cannot be secured, and the expansion means 23b does not operate normally. Therefore, when the high pressure on the refrigeration side becomes lower than a preset lower limit value, a part of the refrigerant is bypassed to the front of the liquid reservoir 26 without passing through the heat exchanger 42 by the action of the high pressure maintaining means 32, and the high pressure is increased. Prevents the temperature control of the device from being heard below the lower limit.

  Next, the operation state and energy saving measures of the refrigerated air conditioning integrated machine 11 when the operation of the air conditioner varies depending on the season will be described. In the summer, since the air conditioner performs cooling operation, there is no heat exchange between the refrigerants in the integrated heat exchanger 42, and the air conditioner and the refrigerator perform maximum heat exchange with air. The blower fan 25c is fully operated. Even when the air conditioner is stopped in spring or autumn, since the refrigerator performs maximum heat exchange with air, the blower fan 25c of the integrated heat exchanger is fully operated. At this time, the size of the radiating fins 41 of the integrated heat exchanger is large, that is, the presence of two flow paths works effectively for heat radiation in the operation of the refrigerator. If the air conditioner is in heating operation as in early spring or late autumn and the air conditioning load is small, heat exchange between the air conditioning side and refrigeration side refrigerant in the integrated heat exchanger 42 is performed, but the amount of heat exchange is Since it is not so large, it is necessary for both the air conditioner and the refrigerator to sufficiently exchange heat with air, and the blower fan 25c of the integrated heat exchanger is fully operated. When the heating load increases in winter and the high pressure on the refrigeration side approaches the lower limit value, it is necessary to reduce the amount of condensation heat on the refrigeration side. Therefore, the rotational speed of the blower fan 25c of the integrated heat exchanger is reduced, and the air conditioning side The amount of heat exchange with air is reduced while ensuring the maximum amount of heat exchange between the refrigerant and the refrigeration side refrigerant so that the high pressure on the refrigeration side does not drop too much. And if the heating load of an air conditioner further increases, finally the ventilation fan 25c of an integrated heat exchanger will be stopped. At this time, the amount of heat of evaporation of the air-conditioning side refrigerant and the amount of heat of condensation of the refrigeration-side refrigerant are provided only by heat exchange between the air-conditioning side and refrigeration side refrigerants, which is effective for energy saving. When the heating load of the air conditioning during mid-winter becomes excessive and the discharge pressure of the refrigerator is low and reaches a minimum pressure at which the differential pressure of the expansion means 23b can be maintained, the action of the high-pressure maintenance means 32 for maintaining the high pressure of the refrigerator. Thus, the refrigerant is bypassed via the bypass flow path 24c, the amount of the refrigerant flowing to the refrigeration flow path 24b of the integrated heat exchanger is reduced, and the operation is performed while maintaining the high pressure on the refrigeration side while collecting the exhaust heat of the air conditioner. As described above, in the refrigeration air conditioner that exchanges heat between independent flow paths having an integrated heat exchanger and saves energy, each refrigeration cycle is fully operated rather than heat exchange as in cooling. In order to effectively perform heat exchange with an integrated heat exchanger, the air-cooling side evaporating temperature and the refrigeration or freezing side condensing temperature are made as close as possible to reduce the compression ratio on at least one side, preferably both sides, by a blower 25c or the like. Adjust it.

  Normally, the air-conditioning compressor 21a performs frequency control based on the temperature difference between the set temperature in the store and the indoor suction temperature. However, a compressor using a motor such as a constant speed induction motor without this control is used. You may do it. Even if the compressor is not controlled, the indoor heat exchanger fan 25a, the expansion valve 23a, and the compressor 21a are turned on and off to operate in accordance with the air conditioning load in the store. The refrigeration side compressor 21b performs frequency control to maintain the refrigeration side low pressure, but the temperature adjustment in the showcase or the like may be performed by the refrigeration or freezing fan 25b or the expansion valve 23b. Therefore, like the air conditioning, the refrigeration compressor 21b may be a constant speed compressor without frequency control. When the air conditioning power is smaller than the refrigeration power or the like, the blower fan 25c of the integrated heat exchanger is operated at the maximum speed, and the rotation speed is decreased as the air conditioning power becomes larger than the refrigeration power or the like. The air blower is stopped when the air conditioning power becomes larger than the stage where heat or the like almost recovers the exhaust air heat. Further, the bypass refrigerant amount in the bypass flow path 24c of the refrigeration or refrigeration side refrigeration cycle is not bypassed up to the minimum set amount of the refrigeration side high pressure, and the air conditioning power is further increased so that the refrigeration side high pressure becomes less than the set value. In this case, the bypass amount is gradually increased to the maximum bypass amount determined by the circuit of the refrigeration cycle.

  Next, with reference to FIGS. 4 to 6, a heat exchanging portion structure which is a detailed structure of the integrated heat exchanger will be described. In FIG. 4, the air conditioning flow path 24a and the refrigeration or freezing flow path 24b are separated and inserted into the same heat radiation fin 41 so as to be integrated with the fin and transfer heat between the refrigerants flowing through the respective flow paths by heat transfer. As shown in the figure, one inlet is the other outlet so that the heat of condensation of both is not partially concentrated during air-conditioning cooling, and the evaporation heat of the air-conditioning refrigeration cycle during air-conditioning heating and the refrigeration refrigeration cycle The heat exchange performance is improved by obtaining a temperature difference of the heat of condensation. In addition, since the tubes of the heat exchanger are not crossed, the manufacturing is simplified. FIG. 5 shows a structure in which the air-conditioning flow path 24a and the refrigeration or freezing flow path 24b are crossed to further improve the heat transfer through the fins 41. In FIG. 4, the blower fan 42 blows air from the refrigeration or refrigeration flow path 24b side. This is because the high-temperature and high-pressure refrigeration-side refrigerant radiates heat in the flow path 24b and heat-exchanges with low-temperature air. However, since the low-temperature and low-pressure air-conditioning side refrigerant absorbs heat in the flow path 24a, the amount of heat exchange increases when heat is exchanged with high-temperature air. In order to increase the amount of heat exchange and improve efficiency by exchanging heat with the refrigeration-side refrigerant passing through the flow path 24b and exchanging heat with the air that has been slightly warmed with the air-conditioning side refrigerant passing through the air-conditioning flow path 24a. is there. However, as a matter of course, in the structure as shown in FIG. FIG. 6 is a structural example using a heat exchanger having a double pipe structure, in which the outside of the double pipe is used as a refrigeration or freezing flow path 24b, and the inside thereof is used as an air conditioning side flow path 24a. The air-conditioning side refrigerant exchanges heat only with the refrigeration-side refrigerant, and the refrigeration-side refrigerant exchanges heat with the air-conditioning side refrigerant as well as heat exchange with the surrounding air by blowing from the outside of the integrated heat exchanger by the fan 25c. It is effective during heating. If the directions of the refrigerant flowing in both the inner and outer flow paths 24a and 24b are reversed as shown in the figure, the performance is improved as described above. The heat transfer between the two flow paths is further improved by this double tube structure heat exchanger. Note that the air conditioning side flow path is formed by using the cooling or freezing flow path 24b as a box without using a double pipe for heat exchange between the air conditioning side flow path 24a and the cooling or freezing flow path 24b. By storing the pipe 24a inside and further cooling by separately arranging a water pipe, an efficient refrigerating and air-conditioning apparatus can be obtained even for a large facility.

  FIG. 7 is a diagram showing a configuration effective not only for energy-saving measures during heating but also during cooling, and a sub heat exchanger 22d for refrigeration or freezing is provided in the bypass passage 24c having the configuration shown in FIG. In FIG. 7, as described above, the amount of refrigerant flowing to the bypass flow path 24c by the action of the flow path control means 32 is set so that the high pressure on the refrigeration side does not decrease too much when the outside air temperature in winter is low and the heating load is excessive. adjust. At this time, the high-temperature and high-pressure gas refrigerant that has flowed into the bypass flow path 24c is bypassed to the outlet side of the integrated heat exchanger 42 without exchanging heat, and merged with the liquid refrigerant condensed in the integrated heat exchanger 42. To do. At this time, if there is more condensed liquid refrigerant than bypassed gas refrigerant, the refrigerant can be completely liquid before reaching the liquid reservoir 26 by the action of the supercooling means 33. However, when the outside air temperature is particularly low or the heating load is particularly excessive, almost the entire amount of refrigerant passes through the bypass passage 24c, and the ratio of refrigerant gas to the supercooling means 33 is large. The supercooling means 33 cannot be sufficiently liquefied, and a gas-mixed refrigerant is supplied to the liquid reservoir, resulting in an unstable refrigeration cycle. Therefore, the refrigerant passing through the bypass passage 24c is exchanged with ambient air by the action of the refrigeration or refrigeration sub-heat exchanger 22d and the blower fan 25d, and the gas-liquid two-phase can be liquefied by the liquid refrigerant or the supercooling means 33. Use refrigerant to prevent the refrigeration cycle from becoming unstable. Of course, the fan 25d for the refrigeration or refrigeration sub heat exchanger 22d uses the blower fan 25c for the integrated heat exchanger 42 and no special fan is required.

  FIG. 8 is a block diagram for improving heat exchange performance throughout the year by further increasing the amount of heat exchange during cooling as well as energy-saving measures during heating in FIG. 7. The bypass channel 24c having the configuration in FIG. Alternatively, not only the refrigeration sub-heat exchanger 22d is provided, but also the air-conditioning side refrigeration cycle is provided with an air-conditioning sub-heat exchanger 22e in parallel with the integral heat exchanger 42 in series with expansion means. In this case, the integrated heat exchanger 42 does not perform ventilation like the plate heat exchanger or the double pipe heat exchanger, and only needs to exchange heat between the air conditioning flow path 24a and the refrigeration or freezing flow path 24b. Can be anything. When heat exchange such as when the air-conditioning side is heating is effective, the flow control means 32 causes the refrigerant to flow through the integrated heat exchanger 42, that is, the heat transfer with the refrigerant having different temperatures flowing through the flow path for refrigeration or freezing. When it is effective for energy saving, the refrigerant is allowed to flow through the integrated heat exchanger 42, and when it is desired that the air conditioner is fully operated as in cooling, the flow path control means 32 is provided in the bypass flow path for refrigeration or freezing. The sub heat exchanger 22d for air conditioning may be used, or the sub heat exchanger 22e for air conditioning may be fully utilized together with the expansion means in series by an expansion means provided in the flow path 24a for air conditioning. At this time, since the air conditioning sub heat exchanger 22e is fully used on the air conditioning side, the air conditioning expansion means 23a can be closed so that no refrigerant flows through the flow path 24a. The reduction of the compression ratio can be adjusted by the blower fans 25d and 25e provided in the respective sub heat exchangers. Of course, although the space saving effect is lost, the effect of reducing the compression ratio is the same even if the integrated heat exchanger 42 is a heat exchanger with a blower. It is also clear from the above description that the configuration excluding the refrigeration sub heat exchanger 22d from the configuration of FIG. It is also possible to utilize the integrated heat exchanger 42 for air conditioning without exchanging heat with the refrigeration side. That is, by operating the flow path control means 32 and controlling the air conditioning expansion means 23a without flowing the refrigerant through the refrigeration flow path 24b, the refrigerant flows to the integrated heat exchanger 42. At this time, the integrated heat exchanger 42 If a heat exchanger fan is provided in the air conditioner, it can cope with a large cooling load together with the air conditioning sub heat exchanger 22e.

  FIG. 9 is a block diagram that increases the amount of heat exchange and improves the heat exchange performance throughout the year from the configuration effective not only for energy saving during heating but also during cooling. FIG. 9 shows an integrated heat exchanger having the configuration of FIG. 42, the air conditioning side refrigeration cycle has the same configuration as the integrated heat exchanger 42 in parallel with the integrated heat exchanger 42, that is, the second air conditioning flow path 24a (2) and the second refrigeration or refrigeration. This is a configuration in which a sub-integrated heat exchanger 42 (2) capable of exchanging heat with each other is provided in the flow path 24b (2). The integral heat exchanger 42 and the sub-integrated heat exchanger 42 (2) can increase the amount of heat exchange in both flow paths, and further, expansion means provided in series with the sub-integrated heat exchanger 42 (2). By adjusting the refrigerant pressure and the refrigerant quantity by the expansion means 23a of the air-conditioning side refrigeration cycle 23a (2), the air-conditioning can be fully operated at the time of cooling. In this case, the sub-integrated heat exchanger 42 (2) does not ventilate like the plate heat exchanger or the double pipe heat exchanger, and the air conditioning flow path 24a (2) and the refrigeration or freezing flow path 24b (2). If only heat exchange is performed, the size can be reduced. 7 and 8 show auxiliary heat exchangers provided in parallel to the integrated heat exchanger 42 in FIG. 2, and FIG. 9 shows a plurality of integrated heat exchangers 42 in FIG. 2 provided in parallel. Among the heat exchangers provided as outdoor units, the refrigerant flows through a plurality of integrated heat exchangers, the refrigerant flows through only one side of the integrated heat exchanger, or only through the auxiliary heat exchanger while saving energy. As described above, it is possible to always operate the refrigeration system and to perform air conditioning comfortably. In other words, during heating, energy is saved in the direction of full flow to both, and during cooling, each refrigeration cycle can be operated independently using the heat radiation area of the integrated heat exchanger.

  Note that the integrated heat exchanger 42 and the sub-integrated heat exchanger 42 (2) described in FIGS. 1 to 9 or the other sub-heat exchanger is a plate fin type heat exchanger, and a fan between the fins is blown. It may be a type that actively exchanges heat between the fins and air, or a plate type, that is, a different flow on both sides of the plate to mainly exchange heat between the two flow paths. Various types may be employed, such as a type in which the other flow path is provided, a double pipe, or a flow path in one flow path. In this case, the air blow by the air blower is limited to the air flow to one flow path, or the air blower is not provided. Or it can be arranged to blow air to a double pipe heat exchanger or a plate heat exchanger at the same time as air to a plate fin type heat exchanger such as an air-cooled integrated type. In this case, the latter is placed on the leeward side. The air flow to the air-cooled heat exchanger does not need to be disturbed, and the heat exchange performance can be improved with energy saving. Further, a refrigerant-refrigerant heat exchanger such as a double pipe may be insulated from the air-cooled heat exchanger to block the air flow. However, the refrigerant on the refrigeration side is only somewhat condensed by air without being insulated.

  FIG. 10 is a configuration diagram of the refrigeration air conditioner, and describes detection means necessary for adjusting the heat exchange amount of the integrated heat exchanger 42 in the refrigeration air conditioner of FIG. The air conditioner indoor heat exchanger 22a is provided with an air conditioner side heat exchanger temperature detector 52 and an air conditioner side heat exchanger temperature detector 52 for measuring the tube temperature of the air conditioner indoor heat exchanger 22a. The air conditioning side heat exchanger temperature detecting means 52 may be a pressure detecting means provided on the discharge side or suction side of the air conditioning compressor 21a. The integrated heat exchanger 42 is provided with refrigeration side or refrigeration side condensation temperature detection means 62. The condensation temperature detecting means 62 may be a high pressure detecting means provided on the discharge side of the refrigeration or refrigeration compressor 21b. When the discharge pressure of the compressor 21b, which is already a high pressure in the refrigeration side or the refrigeration side refrigeration cycle, is detected and the flow path control means 32 is adjusted and the pressure falls below a preset minimum pressure, the refrigerant is supplied to the bypass 24c. This operation is performed according to the condensation temperature or the detection value of the high-pressure detection means 62. In addition, as the high-pressure maintaining means 32, a mechanism that mechanically maintains the pressure on the integrated heat exchanger 42 side at a certain value or more may be used. In addition, refrigeration refrigerant low-pressure detection means 61 is also provided. However, the evaporation temperature of this circuit having the same meaning as this detection means may be detected, or the ambient air temperature of the load-side heat exchanger 22b may be detected and replaced. Next, a configuration capable of increasing the heat exchange amount of the integrated heat exchanger and performing an effective energy saving operation for each operation condition will be described with reference to FIG.

  In FIG. 11, the integrated heat exchanger 42 is divided into a plurality and connected in series, and is housed in a box of an outdoor heat exchanger as a heat source unit together with the compressors 21a and 21b and valves. Instead of installing the integrated heat exchanger 42 as shown in FIG. 9 so as to transfer heat in parallel to the refrigerant flows of the air conditioning refrigerant cycle and the refrigeration refrigerant cycle, the refrigerant flows of both refrigerant cycles The two integrated heat exchangers perform mutual heat exchange between the air conditioning flow path 24a and the refrigeration or freezing flow path 24b, respectively, while one is a plate heat exchanger. It is an integrated heat exchanger 42 (1) that does not actively exchange heat with ambient air by a blower fan or the like, that is, a double-tube heat exchanger, that is, a refrigerant-refrigerant integrated heat exchanger. The integrated heat exchanger 42 (2) connected in series with this also performs heat exchange with the surrounding air by the blower 25c, and can also adjust the heat exchange amount by changing the number of rotations of the blower 25c. This is an air-cooled integrated heat exchanger. Other configurations are the same as the configuration of FIG. 2 and the like, thereby increasing the amount of heat exchange between the two flow paths. In addition, the heat source of the refrigeration air conditioner, which is an outdoor unit that is more effective in energy conservation measures due to increased heat exchange, is an integrated heat exchanger with the air conditioning and refrigeration or refrigeration cycles separated separately. Since 42 (1) and 42 (2) are connected in series with each other, an integrated heat exchanger is arranged in the center of one box, and the air-conditioning side refrigeration cycle and the refrigeration cycle for refrigeration are arranged in order on both sides. It can be arranged, and the pipe connection part with the outside is also gathered at a position where it can be easily connected on both sides and near the upper or lower central part. When the outdoor heat exchanger is configured as a heat source unit by dividing the integrated heat exchanger 42 into a plurality of units and connecting them in parallel or in series, it is limited to only two main and auxiliary heat exchangers as described above. Naturally, more heat exchangers may be used, not only the main and auxiliary, or the presence or absence of heat transfer control to the outside air by the blower fan, for example both Naturally, a blower fan may be provided in the integrated heat exchanger.

  12 and 13, as in FIG. 11, the integrated heat exchanger 42 increases the amount of heat exchange, and the two separated so as to efficiently cope with each operation state are the air conditioning channel 24 a and the refrigerator or freezer. Refrigerant-integrated heat that performs mutual heat exchange with the flow path 24b and does not actively exchange heat with ambient air by a blower fan or the like, such as a plate heat exchanger or a double pipe heat exchanger. Exchanger 42 (1). The air-cooled integrated heat exchanger 42 (2) connected in series with this also performs heat exchange with the surrounding air by the blower 25c, and can also adjust the heat exchange amount by changing the rotation speed of the blower 25c. . In this regard, the control operation will be described. In the figure, 34 is an integrated heat exchange path switching means, A and B are symbols representing flow paths, 35 (1) and 35 (2) shown in FIG. 13 are check valves, and 42 (1) is an integrated heat exchanger. No air blower is attached because only the heat exchange between the air-conditioning side refrigerant and the refrigeration-side refrigerant is performed. A fan is attached to perform heat exchange. The other configuration is the same as the configuration of FIGS. 2 to 11 described above, and the operation is performed in the same manner.

  First, the case where the air conditioning side in the intermediate period and the winter period is stopped or performing the heating operation in the configuration of FIG. 12 will be described. When there is no air conditioning load and the refrigerant circulation on the air conditioning side is stopped, the integrated heat exchange path switching means 34 is set to the position B in order to prevent the refrigerant from condensing into the integrated heat exchanger 42 (2). The refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, passes through the refrigeration flow path 24b (1) of the integrated heat exchanger 42 (1), and enters the integrated heat exchanger 42 (2). It reaches the flow path 24b (2) for refrigeration. At this time, since the refrigerant circulation on the air conditioning side is stopped, heat exchange is not performed in the integrated heat exchanger 42 (1). In the integrated heat exchanger 42 (2), heat is exchanged with ambient air by the action of the blower fan 25 c to condense, expand through the supercooling means 33 and the liquid reservoir 26, and expand in the expansion means 23 b, and are low-temperature and low-pressure refrigerant. It evaporates in the refrigeration heat exchanger 22b that generates cold air that cools the food, which is a load, at a predetermined low temperature, and returns to the compressor 21b. When the outside air temperature is too low and the high pressure in the refrigeration side refrigeration cycle is too low, a part of the refrigerant is bypassed by the high pressure maintaining means 32 in order to maintain the differential pressure of the expansion means 23b and ensure normal operation. The high pressure is prevented from being lowered by flowing it to the path 24c. If the high pressure is still too low, the rotational speed of the blower 25c is reduced.

  Next, a case where there is a little air conditioning load will be described. When there is an air conditioning load that is not so large, that is, when the air conditioning side refrigerant evaporating heat amount <the refrigeration side refrigerant condensing heat amount holds, the integrated heat AC path switching means 34 is set to the position B. The operation in this state is referred to as mode B. The air-conditioning side refrigerant is compressed by the air-conditioning compressor 21a to become a high-temperature and high-pressure refrigerant, and is sent to the air-conditioning-side indoor heat exchanger 22a that is a load to heat the room. Then, heat is exchanged with the indoor air by the action of the blower fan 25a to condense, expand in the expansion means 23a to become a low-temperature and low-pressure refrigerant, pass through the integrated heat AC path switching means 34, and then the integrated heat exchanger 42 ( 1) is sent to the air conditioning flow path 24a (1), where it evaporates by exchanging heat with the high-temperature and high-pressure refrigerant on the refrigeration side, and returns to the air conditioning compressor 21a. Since the refrigerant circulating in the refrigeration cycle is evaporated and gasified by absorbing heat from the surrounding medium in the evaporator, the temperature of the refrigerant in the evaporator cannot be higher than the temperature of the surrounding medium. In mode B, the air-conditioning side refrigerant absorbs heat from the high-temperature refrigeration-side refrigerant in the integrated heat exchanger 42 (1) and evaporates. Therefore, the evaporation temperature is high-temperature and high-pressure refrigeration regardless of the low-temperature outside air. Since it is determined by the temperature of the side refrigerant and the amount of heat exchange in the integrated heat exchanger 42 (1) and can be kept at a high value, a very efficient operation is possible. Therefore, it is necessary not to apply air from the outside due to ventilation or the like to the air-conditioning side refrigerant in the integrated heat exchanger 42 (1). On the other hand, the refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, and passes through the refrigeration flow path 24b (1) of the integrated heat exchanger 42 (1), so that the integrated heat exchanger 42 (2 ) To the refrigeration flow path 24b (2). At this time, since the low-temperature and low-pressure refrigerant on the air conditioning side passes only through the integrated heat exchanger 42 (1), in the refrigerant-refrigerant integrated heat exchanger 42 (1), the refrigeration side refrigerant is the low-temperature and low-pressure air conditioning side. It exchanges heat with the refrigerant to condense. However, since the amount of heat of evaporation on the air conditioning side is not so large, the refrigerant on the refrigeration side cannot be completely condensed and reaches the air-cooled integrated heat exchanger 42 (2). In the air-cooled integrated heat exchanger 42 (2), heat is exchanged with the surrounding air by the action of the blower fan 25c to condense, expand through the supercooling means 33 and the liquid reservoir 26, and expand in the expansion means 23b, and are cooled at low temperature and low pressure. It becomes a refrigerant, evaporates in the refrigeration heat exchanger 22b, and returns to the compressor 21b. The operation when the outside air temperature is too low is the same as before.

  Next, the case where the air conditioning heating load is large will be described. When the air conditioning load is large, the integrated thermal AC path switching means 34 is set to the position A. The operation in this state is referred to as mode A. The air-conditioning side refrigerant is compressed by the air-conditioning compressor 21a to become a high-temperature and high-pressure refrigerant, sent to the air-conditioning side indoor heat exchanger 22a, and condensed by exchanging heat with ambient air by the action of the blower fan 25a. The low-temperature and low-pressure refrigerant expands at 23a, passes through the integrated heat exchange path switching means 34, passes through the air conditioning flow path 24a (2) of the integrated heat exchanger 42 (2), and the integrated heat exchanger 42 (1 ) To the air conditioning flow path 24a (1). In the integrated heat exchanger 42 (2), heat exchange with the high-temperature and high-pressure refrigerant on the refrigeration side and heat exchange with the ambient air by the action of the blower 25c are performed, and further, refrigeration is performed in the integrated heat exchanger 42 (1). Heat exchange with the high-temperature and high-pressure refrigerant on the side is performed again, and the evaporated refrigerant returns to the air conditioning compressor 21a. On the other hand, the refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, and passes through the refrigeration flow path 24b (1) of the integrated heat exchanger 42 (1), so that the integrated heat exchanger 42 (2 ) To the refrigeration flow path 24b (2). At this time, the low-temperature and low-pressure refrigerant on the air conditioning side passes through both the integrated heat exchangers 42 (1) and 42 (2). In the integrated heat exchanger 42 (1), the refrigerant on the refrigeration side condenses by exchanging heat with the low-temperature and low-pressure air-conditioning side refrigerant. However, since the heat exchange amount obtained by the integrated heat exchanger 42 (1) is smaller than the necessary heat of condensation of the refrigeration-side refrigerant, the refrigeration-side refrigerant cannot be completely condensed and the integrated heat exchanger 42 ( To 2). In the integrated heat exchanger 42 (2), the heat is exchanged with the high-temperature and high-pressure air-conditioning-side refrigerant and the heat exchange with the surrounding air by the action of the blower fan 25c, and is expanded through the supercooling means 33 and the liquid reservoir 26. It expands in the means 23b to become a low-temperature and low-pressure refrigerant, evaporates in the refrigeration heat exchanger 22b, and returns to the compressor 21b. The operation when the outside air temperature is too low is the same as before.

  Next, a method of switching between mode A and mode B will be described with reference to FIG. FIG. 14 is a flowchart showing the flow of mode switching. After the start of the determination (ST1), if the operation on the air conditioning side is stopped (ST2), the mode is switched to mode B (ST3), and if not stopped, the mode is not switched and the process proceeds to the next step. In ST4, the flow is separated by the operation mode.

  In mode B, the air-conditioning side refrigerant exchanges heat only with the high-temperature and high-pressure refrigeration side refrigerant, and when the air-conditioning load is not so large, the air-conditioning side evaporating temperature approaches the high-temperature and high-pressure refrigeration side refrigerant temperature, It becomes. When the air conditioning load increases, the amount of heat of evaporation of the refrigerant is secured, so that the evaporation temperature of the air conditioning side refrigerant decreases. When the air conditioning load further increases, the outside air temperature−air conditioning side evaporation temperature> α is established. Here, α is a positive constant originally set. When this condition is satisfied, the input of the air conditioning compressor 21a is reduced when the outside air is also used to evaporate the air conditioning side refrigerant. Therefore, it is determined whether or not the outside air temperature-air conditioning side evaporation temperature> α (ST5). If this condition is satisfied, the mode is switched to mode A (ST6), and the amount of heat of the outside air can also be used for evaporation, and the flow goes out. (ST9).

  In mode A, the air-conditioning side refrigerant exchanges heat with both the high-temperature and high-pressure refrigeration-side refrigerant and the outside air, and the outside air temperature-air-conditioning side evaporation temperature> 0 holds. When the mode B is switched to the mode A, the heat transfer area of the evaporator on the air conditioning side increases, so the value of the outside air temperature-air conditioning side evaporation temperature is the value before switching (outside air temperature-air conditioning side evaporation temperature> α). (Α> outside air temperature−air conditioning side evaporation temperature> 0). Thereafter, the outside air temperature-air conditioning side evaporation temperature increases as the air conditioning load increases, and decreases as the air conditioning load decreases. When the air conditioning load is further reduced, the outside air temperature−air conditioning side evaporation temperature <β is established. Here, β is a constant that is originally set and is a value in a range of α> β> 0. When this condition is satisfied, the input of the air-conditioning compressor 21a is reduced when the outside air is not used to evaporate the air-conditioning side refrigerant and only the heat exchange with the refrigeration side refrigerant evaporates. Therefore, it is determined whether or not the outside air temperature-air conditioning side evaporation temperature <β (ST7). If this condition is satisfied, the mode is switched to mode B (ST8), and the flow is exited (ST9).

  Although the low-pressure channel switching means can be switched by the above flow, there is a possibility that switching from mode A to mode B may not be performed appropriately. That is, switching from mode A to mode B is performed when it is determined that driving in mode B improves efficiency. The judgment is made with the outside air temperature-air conditioning side evaporation temperature <β, but since the heat transfer area of the integrated heat exchanger is quite large, the value of β is set to a smaller value and the air conditioning load is reduced. Even if it changes, the outside air temperature-air-conditioning side evaporation temperature changes only slightly. Further, as long as the integrated heat exchanger 42 (2) that absorbs heat from the outside air is used, the outside air temperature-air conditioning side evaporation temperature> 0 always holds, and this is the lower limit. In other words, the outside air temperature-the air-conditioning side evaporation temperature is not sensitive to changes in the air-conditioning load. is there. Therefore, it is determined whether or not the outside air temperature-air conditioning side evaporation temperature> α (ST5). If this condition is satisfied, the operating frequency of the air conditioning compressor 21a at that time is stored as shown in FIG. 15 (ST20). ) And switch to mode A (ST6). When the air conditioning load is reduced, the operating frequency of the air conditioning compressor 21a is also reduced. Therefore, when the operating frequency of the air conditioning compressor 21a is monitored and becomes lower than the frequency stored at the previous mode switching ( In ST7a), the mode A is switched to the mode B (ST8). By correcting the control flow in this way, there are cases where mode switching can be performed appropriately.

  Next, the case where the air conditioning side in the summer is performing a cooling operation will be described. When the air conditioning side is performing the cooling operation, in FIG. 12, the integrated thermal AC path switching means 34 is set to the position A, and the air conditioning side refrigerant is compressed by the air conditioning compressor 21a to become a high-temperature and high-pressure refrigerant. The air conditioning flow path 24a (1) of the integrated heat exchanger 42 (1) passes through the air conditioning flow path 24a (2) of the integrated heat exchanger 42 (2). At this time, the movement of the refrigerant on the refrigeration side is the same as described above, and the refrigeration flow paths 24b (1) and 24b (2) of the integrated heat exchangers 42 (1) and 42 (2) are subjected to high temperature and high pressure. Refrigerant flows in. Therefore, since there is almost no temperature difference between the air-conditioning side refrigerant and the refrigeration-side refrigerant in the integrated heat exchanger, heat exchange between the refrigerants is not performed, and the air-conditioning side refrigerant is blown in the integrated heat exchanger 42 (2). By the action of 25c, heat is exchanged only with the surrounding air to condense, and after passing through the integrated thermal AC path switching means 34, the air conditioning expansion means 23a expands into a low-temperature and low-pressure refrigerant, and the air conditioning indoor heat exchanger 23a that is a load. Evaporates to cool the indoor air, and returns to the air conditioning compressor 21a via the flow path switching means 31. In this cooling operation, the refrigeration side and the air conditioning side operate almost independently without exchanging heat.

  However, since the air conditioning compressor 21a and the refrigeration compressor 21b are respectively controlled by inverters, the temperatures of the high-temperature and high-pressure refrigerants in the two refrigeration cycle condensers may be different. If this temperature is different, the refrigeration side and the air conditioning side should move independently, but heat exchange is performed between the high-temperature and high-pressure refrigerants in the integrated heat exchanger 42 (1), resulting in inefficient operation. There is also a possibility of end. Therefore, the refrigerant circuit may be as shown in FIG. In FIG. 13, check valves 35 (1) and 35 (2) are added. When the circuit is configured in this manner, the air-conditioning-side refrigerant passes through the air-conditioning flow path 24a (1) in the integrated heat exchanger 42 (1) during the heating operation, and then the check valve 35 (1), the flow path The refrigerant flows so as to return to the air-conditioning compressor 21a through the switching means 31, and moves in the same manner as described above. During the cooling operation, the refrigerant compressed by the air conditioning compressor 21a passes through the flow path switching means 31 and the check valve 35 (2), and then passes through the air conditioning flow path 24a ( 2), the air-conditioning-side refrigerant can be prevented from flowing to the integrated heat exchanger 42 (1), and unnecessary heat exchange with the refrigeration-side refrigerant can be prevented, which is always efficient. You will be able to drive. Note that one or both of the two check valves may be configured as an open / close valve such as a solenoid valve, and the open / close operation may be performed so as to perform the same operation as in the case of the check valve. That is, the energy saving operation using the temperature difference of the refrigerant flowing through the independent flow paths in the integrated heat exchanger by switching the refrigerant flowing through the plurality of integrated heat exchangers provided in series as shown in FIGS. The energy saving operation using the size of the radiation fin by stopping one of the independent flow paths in the integrated heat exchanger can be performed according to the season and the outside air temperature.

  As described above, with the configuration of the present invention, by using a compressor such as a scroll or a rotary driven by an inverter-driven DC brushless motor for the air conditioning compressor 21a, the refrigeration compressor or the refrigeration compressor 21b, the efficiency is further increased. Improvement is possible. Further, a plurality of air conditioner refrigeration cycles can be provided, and an air conditioner that is connected so as to be able to exchange heat with an refrigeration cycle dedicated to air conditioning, a condenser of a refrigeration or refrigeration cycle and an integrated heat exchanger can be provided. That is, as shown in FIG. 1, a plurality of indoor units 12a and refrigeration showcases 13 connected to a specialized indoor unit 12b and a refrigerated air conditioning unit are arranged in a store 14 such as a convenience store. 12b is connected to the outdoor unit 10 for air conditioning, and the indoor unit 12a for air conditioning and the showcase 13 for refrigeration are connected to the integrated unit 11 for refrigerated air conditioning. In this store 14, the air conditioner constituted by the air conditioner outdoor unit 10 and the air conditioner indoor unit 12b is controlled to operate preferentially during cooling. That is, when the store is air-conditioned in the cooling mode, the room temperature target temperature is set lower than that of the air-conditioning unit constituted by the refrigeration / air-conditioning integrated unit 11 and the air-conditioning indoor unit 12a so that the full operation is performed. The air conditioning indoor unit 12b is always larger than the air conditioning indoor unit 12a, and the operation of the air conditioning indoor unit 12b is prioritized.

  On the other hand, the indoor unit 12a for air conditioning connected to the refrigeration / air conditioning integrated unit 11 provided with the integrated heat exchanger 42 is controlled to give priority to the operation during heating. That is, when the store is operated in the heating mode, the target temperature is set higher than that of the air conditioner indoor unit 12b, so that the difference between the detected indoor temperature value and the set value is greater in the indoor air conditioner 12a. It always becomes larger and priority is given to the operation of the air conditioning indoor unit 12a. However, when a common system control device is provided, the air conditioning indoor unit 12b is preferentially kept in full operation preferentially during the cooling operation, and the room temperature setting room is delayed when reaching the set value of the room temperature is delayed from a predetermined time. The operation of the machine 12a may be adjusted. Air conditioning indoor units that are preferentially operated by cooling and heating in this way are those in which the refrigeration cycle specializes in air conditioning and heat exchangers integrated with refrigeration or refrigeration equipment in the indoor unit that is the heat source. By segmenting, it is possible to perform optimum operation according to the characteristics of each outdoor unit from the conventional in-store system of air conditioners and refrigerators, enabling efficient operation and reducing energy. be able to.

  In addition, although the explanation here has been made with respect to the case where the refrigerator / air conditioning integrated unit 11 is housed in one housing, the air-conditioning side refrigeration cycle and the refrigeration side refrigeration cycle can exchange heat with the integrated heat exchanger 42. As long as it is configured as described above, it is not necessary to be housed in one housing. For example, as shown in FIG. 16, the refrigeration / air conditioning integrated machine 11 is composed of two parts, an air-conditioning part 11a and a refrigeration part 11b, each of which is divided into separate housings, and piping between both connection valves 36a and 36b. May be configured to constitute a refrigerator-air-conditioning integrated machine. In FIG. 16, load-side heat exchangers, that is, load-side connection valve portions 37 a and 37 b connected to the indoor heat exchanger 22 a for air conditioning and the indoor heat exchanger 22 b for refrigeration or refrigeration are connected to the connection portions of the respective cases. However, the configuration may be such that these load-side heat exchangers are included in the respective housings. With this configuration, the connection valves 36a and 36b are separated and separated from the air conditioning heat source side connection valve 36a when the air-conditioning load is large, such as when the store floor area is larger or when the store is installed in a northern country such as Hokkaido. By connecting a large-capacity condenser, the air-conditioning capacity can be increased, and there is a merit that it can be configured at a lower cost than when another air-conditioner is newly installed. It can easily cope with equipment changes as well as equipment expansion, and is also effective for maintenance work. Furthermore, as shown in FIG. 19, the refrigerating and air conditioning integrated machine 11 is composed of three parts, an air conditioning part 11a, a refrigeration part 11b, and an integrated heat exchanger part 11c, each of which is divided into separate housings, The connection valves 36a and 36c, 36b and 36c may be connected to form a refrigeration and air conditioning integrated machine. With this configuration, the degree of freedom of installation and configuration is further increased, and the integrated heat exchanger section If a heat exchanger dedicated to air conditioning and a heat exchanger dedicated to refrigeration or refrigeration are connected instead of 11c, the refrigeration cycle for air conditioning and the refrigeration cycle for refrigeration or freezing can be configured completely separately. A free system can be configured according to the needs.

  FIG. 17 shows an integrated heat exchanger 42 which is divided into a plurality of units and can be connected in series, and is housed in a box of an outdoor heat exchanger as a heat source unit together with the compressors 21a and 21b and valves. . Two separate integrated heat exchangers 42 perform mutual heat exchange between the air conditioning flow path 24a and the refrigeration or refrigeration flow path 24b, respectively, while one is a plate heat exchanger or a double pipe heat exchanger. In this way, the refrigerant / refrigerant integrated heat exchanger 42 (1) does not actively exchange heat with ambient air by a blower fan or the like. The air-cooled integrated heat exchanger 42 (2) that can be connected in series with this can also exchange heat with the surrounding air by the blower 25c, and can also adjust the heat exchange amount by changing the rotational speed of the blower 25c. . Other configurations are the same as those in FIGS. 2, 12, 13, and the like, thereby increasing the amount of heat exchange between the two flow paths. In addition, the heat source of the refrigeration air conditioner, which is an outdoor unit that is more effective in energy conservation measures due to increased heat exchange, has an integrated heat exchanger with the air conditioning and refrigeration or refrigeration cycles separated separately. 42 (1) and 42 (2) are pipe-connected in series during cooling, and a refrigerant is allowed to flow through either one during heating so that it can be efficiently handled according to the operating conditions. The other configuration is the same as that of FIGS. 1 to 16 described above, and the operation is performed in the same manner.

  First, the case where the air conditioning side in the intermediate period and the winter period is stopped or performing the heating operation in the configuration of FIG. 17 will be described. When there is no air conditioning load and the refrigerant circulation on the air conditioning side is stopped, the on-off valves 73 and 74 are closed to prevent the refrigerant from condensing into the air-cooled integrated heat exchanger 42 (2). The refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, passes through the refrigeration flow path 24b of the refrigerant-refrigerant integrated heat exchanger 42 (1), and then enters the air-cooled integrated heat exchanger 42 (2). It reaches the refrigeration flow path 24b. At this time, since the refrigerant circulation on the air conditioning side is stopped, heat exchange is not performed in the refrigerant / refrigerant integrated heat exchanger 42 (1). In the air-cooled integrated heat exchanger 42 (2), heat is exchanged with the surrounding air by the action of the blower fan 25c to condense, expand through the liquid reservoir 26 and expand in the expansion means 23b, and become a low-temperature and low-pressure refrigerant. The food is evaporated in the refrigeration heat exchanger 22b that generates cold air to cool the food at a predetermined low temperature, and returns to the compressor 21b. If the outside air temperature is too low and the high pressure in the refrigeration side refrigeration cycle is too low, the on / off valves 76 and 77 that are high pressure maintaining means maintain the differential pressure of the expansion means 23b and ensure normal operation. By flowing a part of the flow into the bypass flow path 24c, the high pressure is prevented from being lowered. If the high pressure is still too low, the rotational speed of the blower 25c is reduced. If priority is given to lowering the rotational speed of the blower 25c over the on-off valve 76, adjustment of the refrigerant becomes unnecessary.

  Next, the case where there is a little heating air conditioning load will be described. When there is an air conditioning load that is not so large, that is, when the air conditioning side refrigerant evaporation heat amount <the refrigeration side refrigerant condensation heat amount holds, the on-off valve 73 is opened and the on-off valve 74 is closed. The air-conditioning side refrigerant is compressed by the air-conditioning compressor 21a to become a high-temperature and high-pressure refrigerant, and is sent to the air-conditioning-side indoor heat exchanger 22a that is a load to heat the room. Then, heat is exchanged with the indoor air by the action of the blower fan 25a to condense, expand in the first throttle means 71 to become a low-temperature and low-pressure refrigerant, and the air-conditioning flow of the refrigerant-refrigerant integrated heat exchanger 42 (1) It is sent to the path 24a, where heat is exchanged with the high-temperature and high-pressure refrigerant on the refrigeration side to evaporate and return to the air conditioning compressor 21a. On the other hand, the refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, and passes through the refrigeration flow path 24b of the refrigerant-refrigerant integrated heat exchanger 42 (1), thereby integrating the air-cooling integrated heat exchanger 42 (2 ) To the refrigeration flow path 24b. At this time, since the low-temperature and low-pressure refrigerant on the air conditioning side passes only through the integrated heat exchanger 42 (1), in the refrigerant-refrigerant integrated heat exchanger 42 (1), the refrigeration side refrigerant is the low-temperature and low-pressure air conditioning side. It exchanges heat with the refrigerant to condense. However, since the amount of heat of evaporation on the air conditioning side is not so large, the refrigerant on the refrigeration side cannot be completely condensed and reaches the air-cooled integrated heat exchanger 42 (2). In the air-cooled integrated heat exchanger 42 (2), heat is exchanged with the surrounding air by the action of the blower fan 25c to condense, expand through the liquid reservoir 26 and expand in the expansion means 23b, and become a low-temperature and low-pressure refrigerant. It evaporates in the heat exchanger 22b and returns to the compressor 21b. The operation when the outside air temperature is too low is the same as before.

  Next, the case where the air conditioning heating load is large will be described. When the air conditioning load during heating is large, the on-off valve 73 is closed and the on-off valve 74 is opened. The air-conditioning side refrigerant is compressed by the air-conditioning compressor 21a to become a high-temperature and high-pressure refrigerant, sent to the air-conditioning side indoor heat exchanger 22a, and condensed by exchanging heat with the surrounding air by the action of the blower fan 25a. The refrigerant is expanded by the capillary 71 as the throttle means to become a medium-temperature / medium-pressure refrigerant, is expanded again in the capillary 72 as the second throttle means, and is sent to the air conditioning flow path 24a of the air-cooled integrated heat exchanger 42 (2). . In the air-cooled integrated heat exchanger 42 (2), heat exchange with the surrounding air is performed by the action of the blower 25c, and the evaporated refrigerant returns to the air conditioning compressor 21a. On the other hand, the refrigerant on the refrigeration side is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, and the on-off valve 77 is closed via the refrigeration flow path 24b of the refrigerant-refrigerant integrated heat exchanger 42 (1). Since 76 is open, the refrigeration flow path 24b of the air-cooled integrated heat exchanger 42 (2) does not pass through the expansion means 23b to the refrigerated showcase heat exchanger 22b. At this time, the low-temperature and low-pressure refrigerant on the air conditioning side passes through both the integrated heat exchangers 42 (1) and 42 (2). In a refrigeration cycle on the air conditioning side during heating and air conditioning with a heavy load, the refrigerant refrigerant integrated heat exchanger is made to have a medium pressure by adopting a circuit configuration in which a throttle means is inserted before and after the refrigerant refrigerant integrated heat exchanger 42 (1). The amount of heat exchange with the refrigeration-side refrigerant is reduced by increasing the evaporation temperature of the refrigerant passing through. For example, when the refrigerant for air conditioning is 4 ° C. with respect to 30 ° C. for refrigeration, it becomes 20 ° C. for air conditioning. If these two throttling means are each a capillary tube, the structure and control become simple. Of course, when the interlock control is performed with the electronic expansion valve, since the controllability is good, the performance is further improved.

  In the refrigeration side refrigeration cycle, the high-temperature and high-pressure refrigerant discharged from the compressor in this case is condensed by the refrigerant-refrigerant integrated heat exchanger, expanded by the expansion valve 23b via the on-off valve 76, and evaporated and compressed by the heat exchanger 22b. Returned to machine 21b. In the refrigeration side refrigeration cycle, the amount of heat exchange in the refrigerant / refrigerant integrated heat exchanger 42 (1) is reduced, but the flow rate of the refrigerant is not decreased, so that the air-cooled integrated heat exchanger is bypassed to prevent high pressure from being lowered. Yes. In other words, even if the air conditioning is stopped or the heating load is small or large, the air-cooled integrated heat exchanger has a circuit configuration in which only one of the air conditioning and the refrigeration flows the refrigerant. If the refrigerant flows, the circuit configuration increases the effective heat transfer area, so that the performance is improved.

  At the time of the cooling operation in the circuit of FIG. 17, first, the refrigerant flow in the air-conditioning side refrigeration cycle is discharged from the compressor 21a, passes through the four-way valve, the on-off valve 73 is closed, and the on-off valve 74 is opened. The air-cooled indoor unit 22a evaporates through the air-cooled integrated heat exchanger 42 (2), the second throttle means 72, the refrigerant / refrigerant integrated heat exchanger 42 (1), and the first throttle means 71, and is cooled and compressed. Returned to the machine. On the other hand, the flow of the refrigerant in the refrigeration-side refrigeration cycle is discharged from the compressor 21b, passes through the heat recovery plate heat exchanger 42 (1) which is a refrigerant-refrigerant integrated compressor, the on-off valve 77 is opened, and the on-off valve 76 is opened. Since it is closed, the air cooling integrated heat exchanger 42 (2) returns to the compressor through the expansion means 23b and the showcase heat exchanger 22b. The refrigeration cycles for both the air conditioning and the refrigeration are operated so as to exhibit the performance independently as described above. In the circuit configuration of FIG. 17, the refrigerant / refrigerant integrated heat exchanger 42 (1) performs the air conditioning. Since the refrigerant for refrigerant is at an intermediate pressure by the two throttle means, the temperature of the air-conditioning side refrigerant is lower than that of the refrigeration-side refrigerant, and the refrigerant / refrigerant integrated heat exchanger 42 (1) is connected between the air-conditioning side and the refrigeration side. Heat transfer occurs. Since the COP on the air conditioning side is originally better than the COP on the refrigeration side, this heat transfer can improve the performance of air conditioning during cooling and total refrigeration. That is, when COP = capacity / input, the lower the evaporation temperature, the larger the input, and the lowering of COP in order to obtain a low temperature for refrigeration can be corrected by the refrigerant flow on the air-conditioning side to improve the performance of the entire apparatus.

  In addition, although the said description demonstrated to the capillary tubes 71 and 72, if not only a performance will improve if it adjusts the pressure of the refrigerant | coolant for air-conditioning in the refrigerant | coolant integrated refrigerant | coolant integrated heat exchanger 42 (1) with an electronic expansion valve, but it is as above. In addition, the heat transfer during cooling can be automatically adjusted according to the operating state. This adjustment can improve the overall performance. For example, the total input can be reduced depending on the cooling state. FIG. 18 is a structural view of the integrated heat exchanger 42, which is the same as that of FIG. 4. The difference from FIG. 4 is that the four refrigerant inlets / outlets of the heat exchanger are provided at one end. . When the inlet / outlet which is connected to the refrigerant pipe is not provided at both end portions as shown in FIG. 4 but is provided on one side as shown in FIG. It can be done from the space facing one end, making it easy to work with the machine, and shortening the work time, such as brazing all four locations at the time of manufacturing. . In addition, although the description here mainly demonstrated about the case where a refrigerator is a refrigerator for freezing, it can be comprised similarly in the case of a refrigerator for freezing, and there exists the same effect.

  In the configuration in FIG. 17, the flow of the refrigerant to the integrated heat exchanger provided for a plurality of air-conditioning-side refrigerant cycles is allowed to flow only to one of the plurality, or to all, or the flow direction is changed. As a result, the operation considering the efficiency of the entire apparatus according to the outside air state and the required level of the air conditioning operation can be performed only by the operation on the air conditioning side. In addition, control that minimizes energy according to the required level of refrigeration, the condition of the outside air and the required level of air conditioning by operating the refrigerant flow on the refrigeration side and fan operation considering heat transfer of the integrated heat exchanger Can be performed according to conditions and control flow preset in the microcomputer of the control device. The flow path switching means 31 has been described as an example of a four-way valve. However, any flow path switching means 31 may be used as long as it can switch the flow path of the refrigerant flowing inside the pipe. For example, a plurality of solenoid valves, two-way valves, or three-way valves may be used.

  In many cases, the configuration diagram of the present embodiment shows that the supercooling means 33 is installed on the upstream side of the liquid reservoir 26. However, in order to simplify the refrigeration cycle and to configure it at low cost, It is good also as a structure which does not install the means 33, and there exists the same effect. Further, the supercooling means 33 may be installed on the downstream side of the liquid reservoir 26. In this case, there is an effect that the refrigeration capacity in the refrigeration or freezing indoor unit 22b which is a showcase can be increased. .

  FIG. 20 is a configuration diagram of a refrigerating and air-conditioning apparatus that can obtain operations and effects similar to those described above with a simple configuration. In the configuration of FIG. 20, the integrated heat exchangers 42 (1) and 42 (2) of the refrigeration side refrigeration cycle are not provided with on-off valves or other flow path switching means, and the refrigeration side or the refrigeration side During the operation, the refrigerant always moves in the same manner with respect to the integrated heat exchanger, and is compressed by the refrigeration compressor 21b to become a high-temperature and high-pressure refrigerant, and the refrigerant / refrigerant integrated heat exchanger 42 (1) is refrigerated. It reaches the refrigeration flow path 24b (2) of the air-cooling integrated heat exchanger 42 (2) through the flow path 24b (1). That is, the refrigeration side refrigeration cycle is greatly simplified. In this configuration, the plurality of integrated heat exchangers 42 (1) or 42 (2) are the same as described above depending on the heating / cooling / stop operation mode on the air conditioning side or the difference in circulation flow path depending on the size of the air conditioning load. In this case, the heat exchange with the air-conditioning-side refrigerant can be performed in a state where a large amount of heat is exchanged, a small amount of heat is exchanged, or no heat exchange is performed. The refrigeration-side refrigeration cycle obtains and condenses the remaining heat necessary for the refrigerant to condense in the air-cooled integrated heat exchanger 42 (2) by dissipating heat to the surrounding air by the action of the blower fan 25c. After passing through the reservoir 26, the refrigerant expands in the expansion means 23b to become a low-temperature and low-pressure refrigerant, evaporates in the refrigeration heat exchanger 22b that generates cold air that cools the food that is a load at a predetermined low temperature, and the compressor 21b Return to. In this configuration, when the outside air temperature is too low and the high pressure in the refrigeration side refrigeration cycle is too low, the differential pressure of the expansion means 23b cannot be maintained, and the refrigerant becomes difficult to flow. Even if the compressor 21b is stopped, the amount of cooling heat necessary for maintaining the freshness of the food is secured by ON / OFF control in which the compressor 21b moves again when the low pressure is restored after a short time has elapsed. Previously, it was explained that the bypass flow path of the condenser is provided in the refrigeration side refrigeration cycle to control the high pressure, but the ON / OFF is automatically performed without providing the bypass flow path in the refrigeration side refrigeration cycle. By adopting a simple configuration in which the control is used, the high pressure is lowered, so that more efficient operation can be performed.

  Next, the operation of the air conditioning side refrigerant when the air conditioning side is performing the heating operation will be described. The air-conditioning side refrigerant is compressed by the air-conditioning compressor 21a to become a high-temperature and high-pressure refrigerant, and is sent to the air-conditioning-side indoor heat exchanger 22a that is a load to heat the room. Then, heat is exchanged with the indoor air by the action of the blower fan 25a to condense, and the air expander 23a expands into a low-temperature and low-pressure refrigerant. Here, when the refrigeration compressor 21b is operating, heat can be recovered from the refrigeration-side refrigerant, so that the refrigerator main mode (open / close valve 73 open, 74 closed, 78 closed) is set. Then, the air-conditioning side refrigerant is sent to the air-conditioning flow path 24a (1) of the refrigerant-refrigerant integrated heat exchanger 42 (1), where it evaporates by exchanging heat with the high-temperature and high-pressure refrigeration-side refrigerant. The valve 35 is returned to the air conditioning compressor 21a. Since the refrigerant circulating in the refrigeration cycle is evaporated and gasified by absorbing heat from the surrounding medium in the evaporator, the temperature of the refrigerant in the evaporator cannot be higher than the temperature of the surrounding medium. In the refrigerator main mode, the air-conditioning-side refrigerant absorbs heat from the high-temperature refrigeration-side refrigerant in the integrated heat exchanger 42 (1) and evaporates. Therefore, the evaporation temperature is high and high pressure regardless of the low-temperature outside air. Since it is determined by the temperature of the refrigeration-side refrigerant and the amount of heat exchange in the integrated heat exchanger 42 (1) and can be kept at a high value, a very efficient operation is possible. However, when the refrigeration compressor 21b is stopped, heat cannot be recovered from the refrigeration side refrigerant, so the air conditioner single operation mode (open / close valve 73 closed, 74 open, 78 open) is set. At this time, the air-conditioning-side refrigerant is sent to the air-conditioning flow path 24a (2) of the air-cooled integrated heat exchanger 42 (2), where it evaporates by exchanging heat with ambient air, and the air-conditioning compressor 21a. Since the operation is performed in a state where the low pressure (evaporation temperature) of the refrigeration cycle on the air conditioning side is low due to the influence of cold outside air, the efficiency is not as good as that in the refrigerator main mode. Therefore, although it is originally intended to move in the refrigerator main mode as much as possible, it cannot always be operated in the refrigerator main mode. The reason will be described next.

  In the refrigerator main mode, when the air conditioning heating load is small or moderate, the amount of heat exchange with the refrigeration side refrigerant in the refrigerant / refrigerant integrated heat exchanger 42 (1) is not so large. It is maintained in an operable state and can maintain the refrigerator main mode. However, when the air-conditioning / heating load is large, the amount of heat exchange with the refrigeration-side refrigerant in the refrigerant-refrigerant integrated heat exchanger 42 (1) increases, so the high pressure of the refrigeration-side refrigeration cycle decreases. When the refrigeration-side refrigeration cycle can continue operation, the refrigerant flow path on the air-conditioning side is not switched, and the operation is performed with an efficient circuit as in the case where the air-conditioning load is small. However, in the refrigeration side refrigeration cycle, when the high pressure is too low and the operation cannot be continued, the refrigeration compressor 21b stops, and if the flow path is left as it is, the amount of heat of evaporation of the air conditioning side refrigerant cannot be secured. Then, the mode is switched to the air conditioner main mode (open / close valve 73 closed, 74 open, 78 open), and the air cooling integrated heat exchanger 42 (2) absorbs heat from the outside air and continues the operation. When the refrigeration compressor 22b starts to move again and heat recovery from the refrigeration side refrigerant is possible, the mode is switched again to the refrigerator main mode (open / close valve 73 open, 74 closed, 78 closed), and refrigerant refrigerant integrated heat exchange is performed. In the vessel 42 (1), heat is exchanged with the refrigeration side refrigerant so as to be operated.

  Even in the defrosting operation when the frosting on the heat exchanger 22b of the showcase that is a refrigeration or refrigeration indoor unit has increased excessively, the refrigeration compressor 21b is stopped, so the same switching is required. There is.

  Further, the switching of the on-off valve accompanying the ON / OFF of the refrigeration compressor 21b is preferably performed immediately before the refrigeration compressor 21b is stopped, but the refrigerant / refrigerant integrated heat exchanger 42 (1) and the inside thereof are switched. Since the flowing refrigeration-side refrigerant has a heat capacity, it can be understood that even if switching is performed immediately after the refrigeration compressor 21b is stopped, the low pressure on the air-conditioning side does not decrease to a point where the operation cannot be continued, and the operation can be continued. ing.

  However, the air-conditioning side refrigerant has a high low pressure when heat exchange is performed with the high-temperature and high-pressure refrigeration refrigerant in the refrigerant-refrigerant integrated heat exchanger 42 (1), but the air-cooled integrated heat exchanger 42 (2). When heat exchange is performed with cold outside air at low pressure, the low pressure decreases. If this change occurs suddenly, liquid back to the air conditioning compressor 21a occurs, and if this is repeated many times, the air conditioning compressor 21a may be broken and the operation cannot be continued. There is.

  Therefore, in practice, it is desirable to take one of the following methods with the stop of the refrigeration compressor 21b. First, the first method is a method of providing a protection function against liquid back by mode switching in hardware, and is a method of placing a restriction such as a capillary tube having a large diameter before and after the on-off valve 74. Then, when the flow path is switched, the refrigerant that has passed through the air-conditioning expansion means 23a is once squeezed, so that a large amount of refrigerant can be prevented from returning to the air-conditioning compressor 21a all at once.

  The second method is to temporarily stop the air conditioning compressor 21a when the refrigeration compressor 21b is stopped. The reason that the liquid back is generated in the air-conditioning compressor 21a and the compressor is damaged is because the refrigerant circulating in the refrigeration cycle returns to the compressor at a stretch by drawing in the low pressure, and once the air-conditioning compressor 21a. If the air-conditioning compressor 21a is moved again after 3 minutes, for example, after 3 minutes, the operation is the same as the normal restart, and the liquid back does not occur. Absent. In this method, the air-conditioning compressor 21a is temporarily stopped, but there is no problem because the room has a heat capacity even if heating is not possible for a short time.

The operation flowchart of FIG. 21 is a flowchart of the operation based on the second method. In FIG. 21, the process flow chart is entered (ST31), the refrigerator 21b is turned on (ST32), and Δt ₁ hour has passed since the refrigerator 21b is turned on (ST33), the refrigerator Switching to the main mode (open / close valve 73 open, 74 closed, 78 closed) (ST34). This Δt ₁ hour is a stable waiting time when the refrigeration compressor 21b is restarted, and may normally be about several minutes, but may be zero in some cases. Then, after Δt ₂ hours have passed since the refrigeration compressor 21b is turned on (ST35), the start-up control is terminated and the normal control is started in the refrigerator side cycle (ST36). However, when the refrigeration compressor 21b is turned off (ST32) or in the refrigerator main mode (ST37), the refrigerant / refrigerant integrated heat exchanger cannot secure the amount of heat for evaporating the air-conditioning side refrigerant. Although it is necessary to switch the heat source to an air-cooled integrated heat exchanger, in order to prevent liquid back to the air conditioning compressor 21a, the air conditioning compressor 21a is temporarily turned off (ST38), and then the air conditioner single operation mode (open / closed) The valve 73 is closed, 74 is opened, and 78 is opened (ST39). After that, after the air conditioning compressor 21a is turned off, it waits for Δt ₄ hours, for example, 3 minutes (ST43) until the refrigerant is stabilized (ST43), and then the air conditioning compressor 21a is turned on, the air conditioning compressor 21a is set to the initial startup frequency, and air conditioning is performed. The expansion valve 23a is set to the initial start opening (ST44). Then, the state is maintained for Δt for ₃ hours, and the system waits for the cycle to stabilize (ST41). Thereafter, the routine proceeds to normal control of the air conditioner (ST42), and the process ends (ST45).

  In the third method, when the refrigeration compressor 21b is stopped, the frequency of the air conditioning compressor 21a is lowered and the opening degree of the air conditioning expansion valve 23a is decreased, and this state is maintained until the state of the air conditioning refrigerant is stabilized. It is to keep for a certain time. Such a movement is performed during normal startup, but it is sufficient to perform the same movement. By doing in this way, while keeping the refrigerant | coolant flow rate which circulates in the refrigerating cycle small, the refrigerant | coolant amount which passes the expansion valve 23a can be decreased, and the failure | damage of the compressor by the liquid back to a compressor can be prevented. it can.

The operation flowchart of FIG. 22 is a flowchart of the operation based on the third method. In FIG. 22, after entering the processing flowchart (ST31), the cycle of the refrigerator side cycle is the same as the operation flowchart of FIG. 21 until the start control is terminated and the normal control is started (ST36), and the description is omitted. When the refrigeration compressor 21b is turned off (ST32), or in the refrigerator main mode (ST37), in the refrigerant / refrigerant integrated heat exchanger, the heat source for evaporating the refrigerant on the air-conditioning side cannot be secured. Although it is necessary to switch to an air-cooled integrated heat exchanger, in order to prevent liquid back to the air-conditioning compressor 21a, the air-conditioning compressor 21a is fixed at a lower frequency, and the air-conditioning expansion valve 23a is fixed at a slightly narrowed opening. (ST50), and the circuit is switched to the air conditioner single operation mode (ST39). Then, it waits for Δt ₅ hours until the state of the air-conditioning side refrigeration cycle is stabilized (ST51), shifts to air conditioner normal control (ST42), and ends the process (ST45).

  By any one of the methods described above, liquid back to the air conditioning compressor 23a can be prevented, damage to the compressor can be prevented, and stable operation can be achieved. Needless to say, when the air conditioning compressor 23a has sufficient strength to withstand liquid back accompanying flow path switching, such a protective operation may not be performed.

  Here, an example has been described in which when the refrigeration compressor 21b starts moving again after being stopped, the mode is switched to the refrigerator main mode after a predetermined time has elapsed. By doing in this way, the time which operates in efficient refrigerator main mode can be lengthened, and it becomes energy saving. However, even in the air conditioner main mode, when the refrigeration compressor is stopped, the air-cooled integrated heat exchanger can be occupied because the air-conditioning side refrigerant evaporates, so the actual heat transfer area increases and outdoor heat exchange The operation is more efficient than operating a separate air conditioner. Therefore, when the compressor for refrigeration 21b starts moving again after being stopped, even if it is left in the air conditioner single operation mode, a problem or energy saving effect can be obtained.

  Next, the cooling operation will be described. In the cooling operation, the on-off valve 73 is closed, 74 is opened, and 78 is opened. Then, the air-conditioning-side refrigerant is discharged from the compressor 21a, passes through the four-way valve 31, passes through the on-off valve 78, and reaches the air-cooled integrated heat exchanger 42 (2), and exchanges heat with ambient air by the action of the blower 25c. The air-conditioning expansion means 23a becomes a low-temperature and low-pressure refrigerant, evaporates in the air-conditioning indoor unit 22a, is cooled, and is returned to the compressor 21a. This movement is the same whether the refrigeration compressor 21b is moving or stopped. In addition, since the movement of the refrigerating cycle for refrigeration is always the same, the description when the refrigerating cycle for air conditioning is stopped is omitted.

  By configuring as described above, during the heating operation, the refrigerant for refrigeration and the refrigerant for air conditioning are efficiently heat-exchanged by the refrigerant-refrigerant integrated heat exchanger, and the state reaches the limit at which the refrigeration compressor can operate. By continuing the operation for a long time, it is possible to obtain a large energy saving effect, and at the time of cooling operation, the air-conditioning refrigerant does not flow to the refrigerant-refrigerant integrated heat exchanger. Regardless of the temperature of the refrigerant on the condensing side on the air conditioning side, that is, regardless of the frequency of both compressors, it is possible to prevent each refrigerant from exchanging heat and operating inefficiently. The performance of can be demonstrated. That is, in the configuration of FIG. 20, the same effect as described above can be obtained by providing a plurality of integrated heat exchangers and switching the individual refrigerants to the integrated heat exchanger.

  In FIG. 23, a plurality of air-conditioning expansion means 23a are connected in series, and an intermediate-pressure receiver 79 is provided between them, so that the refrigerant on the suction side of the air-conditioning compressor 21a and the refrigerant in the intermediate-pressure receiver 79 can exchange heat. It is configured. By configuring in this way, surplus refrigerant on the air conditioning side can be stored in the intermediate pressure receiver 79, so that the amount of refrigerant in the heat exchangers 22a, 24a can be kept optimal, and efficient operation is always possible. It can be carried out. Furthermore, even if there is some liquid back in the air conditioning compressor 21a, it can be evaporated by heat exchange between the intermediate pressure receiver 79 and the suction pipe, and a highly reliable refrigeration cycle can be configured. Other configurations are the same as those in FIG. 20, and operations and effects are the same as those described above.

  FIG. 24 is a structural diagram of an air-cooling integrated heat exchanger, in which the air conditioning flow path 24a and the refrigeration or refrigeration flow path 24b are separated and integrated into the same heat radiation fin 41. Thus, the air conditioning flow path 24a and the refrigeration or refrigeration flow path 24b are separated on both sides of the heat exchanger, so that the heat exchange between the evaporation heat of the air conditioning refrigeration cycle and the condensation heat of the refrigeration refrigeration cycle during air conditioning heating can be achieved. The structure is not very large. By doing so, the flow paths through which both the refrigerants flow are not crossed, so that the manufacturing is simplified, and when the refrigerant is not flowing through one of the flow paths, the flowing refrigerant is part of the other fin. Can be used for condensation or evaporation and can be operated more efficiently than configuring each separately.

  FIG. 25 is a configuration diagram of the refrigeration air conditioner, which describes detection means used for the basic operation of the refrigeration air conditioner of FIG. As the detection means, air-conditioning side discharge temperature detection means 53, air-conditioning-side indoor saturation temperature detection means 54, air-conditioning-side liquid pipe temperature detection means 55, and air-conditioning-side two-phase pipe temperature detection means (for heating) in the refrigerant piping of the air-conditioning side refrigeration cycle 56 (1), air-conditioning side two-phase tube temperature detection means (for cooling) 56 (2), refrigerant piping for the refrigeration side refrigeration cycle, refrigeration side low pressure detection means 61 and refrigeration side high pressure detection means 62, indoors for air temperature detection An air temperature detecting means 51, an outside air temperature detecting means 57, and an internal temperature detecting means 64 are attached.

  In the figure, in the refrigerator main mode, the refrigeration side refrigeration cycle is preset with the refrigeration side low pressure detected by the refrigeration side low pressure detection means 61 and the refrigeration side high pressure detected by the refrigeration side high pressure detection means 62. The frequency of the refrigeration side compressor 21b and the rotation speed of the air cooling integrated heat exchanger fan 25c are controlled so as to approach the target value. Note that the low pressure and high pressure target values on the refrigeration side are stored in advance in memory so that the system can be operated in an energy saving manner. Further, the refrigeration load side opening / closing valve 80 is opened and closed by a separately installed controller so as to keep the temperature detected by the internal temperature detection means 64 constant.

  The air-conditioning side refrigeration cycle is a heating operation in the refrigerator main mode, and the air-conditioning side discharge temperature detecting means 53 sets the discharge temperature, the air-conditioning side indoor saturation temperature detecting means 54 sets the condensation temperature, and the air-conditioning side liquid pipe. The temperature detection means (heating) 55 (1) is used for the liquid pipe temperature, the air conditioning side liquid pipe temperature detection means (cooling) 55 (2) is used for the evaporating temperature, and the air conditioning side two-phase pipe temperature detection means (for heating) 56. The intake temperature is detected in (1), and the indoor air temperature is detected by the indoor air temperature detecting means 51. Superheat defined by the difference between the suction temperature and the evaporation temperature, subcool defined by the difference between the condensation temperature and the liquid pipe temperature, the indoor temperature difference defined by the difference between the condensation temperature and the room air temperature, and the discharge The air conditioning compressor 21a, the air conditioning side expansion valves 23a (1) and 23a (2), and the air cooling integrated heat exchanger blower fan 25c are controlled with the temperature as a target. In the refrigerator main mode, the air-conditioning side two-phase tube temperature detecting means (cooling) 56 (2) is not used because it is not in the refrigerant flow path.

  On the other hand, the air-conditioning side refrigeration cycle is a cooling operation in the air-conditioner single operation mode, and the discharge temperature is detected by the air-conditioning side discharge temperature detecting means 53 and the air-conditioning side two-phase tube temperature detecting means (cooling) 56 (2). The condensation temperature is determined by the air conditioning side liquid pipe temperature detecting means (cooling) 55 (2), the liquid pipe temperature by the air conditioning side liquid pipe temperature detecting means (heating) 55 (1), and the air conditioning side indoor saturation temperature. The detecting means 54 detects the intake temperature, and the indoor air temperature detecting means 51 detects the indoor air temperature. Superheat defined by the difference between the suction temperature and the evaporation temperature, subcool defined by the difference between the condensation temperature and the liquid pipe temperature, the indoor temperature difference defined by the difference between the condensation temperature and the room air temperature, and the discharge The air conditioning compressor 21a, the air conditioning side expansion valves 23a (1) and 23a (2), and the air cooling integrated heat exchanger blower fan 25c are controlled with the temperature as a target. In the air conditioner single operation mode, the detected temperature of the air-conditioning side two-phase tube temperature detecting means (heating) 56 (1) is not used because it is not the temperature of the part necessary as information.

  Thus, depending on whether the air-conditioning side refrigeration cycle is in the heating operation or cooling operation, the temperature detection means is changed to the air-conditioning side two-phase pipe temperature detection means (cooling) 56 (1) and the air-conditioning side two-phase pipe temperature detection means (cooling) 56 ( It is necessary to switch between 2) and 2). As the method, a method of switching by software and a method of switching by hardware using a relay or the like can be considered.

  The air-cooled integrated heat exchanger 42 (2) functions as a condenser of the refrigeration side refrigeration cycle in the refrigerator main mode, and functions as an evaporator of the air conditioning side refrigeration cycle in the air conditioner independent operation mode. In mode, it functions as a condenser for both refrigeration cycles. Therefore, the air cooling integrated heat exchanger blower fan 25c operates to save energy in the refrigeration side refrigeration cycle in the refrigerator main mode, and operates to save energy in the air conditioning side refrigeration cycle in the air conditioner independent operation mode. In the cooling mode, the total energy consumption of the refrigeration-side refrigeration cycle and the air-conditioning-side refrigeration cycle is reduced, and energy saving operation can be realized throughout the year.

  The refrigeration side low pressure detection means 61 and the refrigeration side high pressure detection means 62 can be replaced by temperature detection means for detecting the saturation temperature of each pressure.

  In addition, although the explanation is given here as if only one showcase, which is an indoor unit, is attached to the refrigeration or refrigeration side refrigeration cycle, a plurality of indoor units (shows) are usually included in one refrigeration cycle as shown in FIG. Case) is connected. In this case, for example, referring to FIG. 25, for example, the refrigeration compressor 21b, the integrated heat exchanger 24b, the blower fan 25c, and the liquid reservoir 26 are housed and installed in one or a plurality of cases. The refrigeration or refrigeration load side opening / closing valve 80, the refrigeration or refrigeration expansion means 23b, the refrigeration or refrigeration heat exchanger 22b, and the blower fans 25b are installed indoors, and the liquid reservoir 26 and the refrigeration or refrigeration load side opening / closing are opened. Branches to and from the valve 80. In the other configuration diagrams, the refrigeration or refrigeration load side opening / closing valve 80 is omitted for simplification, but the refrigeration or refrigeration load side opening / closing valve 80 is located near the refrigeration or refrigeration expansion means 23b, respectively. It is installed corresponding to the showcase. As the indoor unit of the refrigeration side refrigeration cycle, an open showcase for refrigeration or refrigeration, a reach-in showcase for refrigeration or refrigeration, a unit cooler for refrigeration or refrigeration, and the like are connected. Each detection means is connected to a control device composed of a microcomputer or the like provided in an electrical component box in a case provided outdoors or indoors and attached to a substrate, and stores data stored in the microcomputer in advance. Control is performed based on the determination and calculation based on the flowchart.

  In the case of the configuration shown in FIGS. 20 to 25, a third heat exchanger, that is, a heat exchanger that exchanges heat between the flow paths that independently flow the refrigerant that circulates in the air-conditioning side refrigeration cycle and the refrigeration or refrigeration side refrigeration cycle, is provided. Provide multiple heat exchangers, one with direct heat exchange between refrigerants, and the other with forced heat release between both refrigerants and air via a common radiating fin. It is possible to switch between this one and another heat exchanger. That is, in the example of the configuration of FIG. 20, when the first refrigerant is caused to flow through the heat exchanger 42 (1), the second refrigerant is not caused to flow through the heat exchanger 42 (2). Further, when the first refrigerant is caused to flow through the heat exchanger 42 (2), the first refrigerant is not caused to flow through the heat exchanger 42 (1). On the other hand, the second refrigerant is always flowing through both heat exchangers 42 (1) and 42 (2). By simplifying the control of the refrigeration cycle on the refrigeration / freezing side and switching the flow path through which the refrigerant flows in the refrigeration cycle on the air conditioning side, the heat control such as heat release during air conditioning operation is simplified. The entire system can be operated stably and can be made highly reliable.

  Assuming that a plate heat exchanger is used as the refrigerant refrigerant integrated heat exchanger and a plate fin type heat exchanger is used as the air cooling integrated heat exchanger, the refrigerant refrigerant integrated heat exchanger is an air cooling integrated heat exchanger. The heat transfer rate (an index indicating thermal efficiency) is several times to several tens of times larger than that of the exchanger, and heat exchange can be made very efficient, so the heat transfer area can be made very small. Can be configured compactly. Therefore, by dividing the integrated heat exchanger into the refrigerant-refrigerant integrated heat exchanger and the air-cooled integrated heat exchanger, it is possible to perform an efficient operation that effectively uses the exhaust heat on the refrigeration side and the air conditioning side, In addition, it is possible to configure a compact system that is not so large in space as compared with the configuration of only the air-cooled integrated heat exchanger.

  In addition, when the heat exchange amount in the refrigerant-refrigerant integrated heat exchanger is as large as possible, the low pressure (evaporation temperature) of the air-conditioning side refrigeration cycle can be increased, and an efficient operation can be performed. However, in reality, if it is too large, the high pressure (condensation temperature) of the refrigeration-side refrigeration cycle is too low, and ON / OFF frequently occurs. At convenience stores, the amount of heat exchange in the refrigerant / refrigerant integrated heat exchanger is the amount of heat in the air / cooled integrated heat exchanger because of the relationship between the heating / air-conditioning load and the refrigeration load, the necessity of maintaining a high pressure in the refrigeration side refrigeration cycle, and cost performance. The size of the heat exchanger is selected to be smaller than the exchange amount.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And a refrigerant that passes through independent channels of the first channel connected to the first heat exchanger and the second channel connected to the second heat exchanger can exchange heat with each other. And a bypass flow path provided in the second flow path in accordance with preset conditions, wherein a part or all of the second refrigerant is bypassed with respect to the third heat exchanger. Therefore, even when the high pressure portion of the refrigeration cycle of the refrigeration or refrigeration apparatus having the integrated heat exchanger as a heat source is likely to become unstable at a low pressure, stable operation can be performed.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, and a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant. And a first flow path having a first compressor connected to the first heat exchanger and a second flow path having a second compressor connected to the second heat exchanger. A third heat exchanger that can exchange heat with each other through the flow path, a blower that adjusts the amount of heat exchange between the third heat exchanger and the ambient air, and a predetermined compressor driven by the first compressor A controller that performs a predetermined refrigeration or refrigeration operation by driving the air-conditioning operation and the second compressor, and changing the air flow rate of the air blower in a direction to reduce the input of both compressors. It is possible to enable efficient operation in any operation mode.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that exchanges heat between normal temperature air and a first refrigerant, and a second heat exchanger that exchanges heat between low-temperature air and a second refrigerant. And a refrigerant that passes through independent channels of the first channel connected to the first heat exchanger and the second channel connected to the second heat exchanger can exchange heat with each other. The third heat exchanger is provided with the first flow path in the second flow path, or the second flow path and the first flow path are formed on both sides of the plate shape. Therefore, it is possible to obtain a small-sized device with a simple structure and low energy.

  The refrigerating and air-conditioning apparatus of the present invention includes a bypass flow path that is provided in the second flow path of the third heat exchanger and bypasses part or all of the second refrigerant to the third heat exchanger. Therefore, efficient and stable operation is possible.

  As described above, the refrigerating and air-conditioning apparatus of the present invention includes the first heat exchanger that is provided on the load side of the first refrigeration cycle in which a plurality of refrigerants are circulated and performs indoor air conditioning, A second heat exchanger that is provided in a second refrigeration cycle independent of the first refrigeration cycle through which the refrigerant is circulated and performs refrigeration or freezing, and at least one flow path on the heat source side of the first refrigeration cycle And a third heat exchanger that exchanges heat with the second refrigerant that passes through the flow path of the second refrigeration cycle, and the first refrigeration that does not exchange heat with the third heat exchanger during cooling Priority is given to the operation in which the refrigerant flows into the flow path on the heat source side of the cycle, and during heating, the flow of refrigerant to the flow path on the heat source side of the first refrigeration cycle that exchanges heat with the third heat exchanger Priority is given to driving. In this case, the flow path on the heat source side of the first refrigeration cycle that does not exchange heat with the third heat exchanger is the third heat exchange that exchanges heat with the second refrigerant passing through the flow path of the second refrigeration cycle. The operation of the entire refrigerating and air-conditioning system composed of a plurality of first heat exchangers and second heat exchangers that bear the load by the operation timing, operation mode This makes it possible to operate efficiently and with less energy.

  The refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that exchanges heat between normal temperature air and a first refrigerant, and a second heat exchanger that exchanges heat between low-temperature air and a second refrigerant. And a third heat exchanger provided integrally with the first and second flow paths and having independent flow paths so that the refrigerant passing through the flow paths exchange heat with each other; A first refrigeration cycle in which the first heat exchanger and the first flow path of the third heat exchanger are connected by piping, and the second of the second heat exchanger and the third heat exchanger. A second refrigeration cycle in which the flow path of the second refrigeration cycle is connected by piping, and a bypass that is provided in the second flow path and that can bypass part of or all of the refrigerant in the second refrigeration cycle through the third heat exchanger A flow path and high pressure maintaining means for adjusting the flow rate of the refrigerant flowing to the bypass flow path according to the pressure on the high pressure side of the second refrigeration cycle are provided. In this case, the second cold air has a lower temperature than the first cold air.

  The refrigerating and air-conditioning apparatus of the present invention includes a bypass flow path that is provided in the second flow path or the second refrigeration cycle and bypasses the third heat exchanger, and a junction portion between the second flow path and the second refrigeration cycle. And a refrigerant subcooling means disposed on the downstream side. This makes the operation of the refrigeration cycle of the refrigeration or refrigeration apparatus stable over a wide range, and enables more accurate temperature control.

  The refrigerating and air-conditioning apparatus of the present invention is arranged in a bypass flow path that bypasses the third heat exchanger provided in the second flow path or the second refrigeration cycle, and performs fourth heat exchange with the surrounding air. Therefore, even in a configuration in which an integrated heat exchanger is provided as a heat source, stable refrigeration or refrigeration cycle operation can be performed. The refrigerating and air-conditioning apparatus of the present invention is arranged in a second bypass flow path that bypasses the third heat exchanger provided in the first flow path or the first refrigeration cycle, and performs heat exchange with ambient air. With the fifth heat exchanger, it has a large capacity and efficient operation for any type of air conditioning.

  In the refrigerating and air-conditioning apparatus of the present invention, the third heat exchanger is a double pipe having the inside as the flow path of the first refrigeration cycle and the outside as the flow path of the second refrigeration cycle. Can be. In the refrigerating and air-conditioning apparatus of the present invention, the third heat exchanger is formed by a first heat exchanging part that can adjust the heat exchanging amount and a second heat exchanging part that does not adjust the heat exchanging amount. Therefore, the heat exchange amount can be adjusted according to the operating state, and a practical apparatus is possible.

  In the refrigerating and air-conditioning apparatus of the present invention, the third heat exchanger has a first heat exchanging unit that adjusts the heat exchanging amount by a change in the air amount that has a fan and changes the speed from the rotation stop, and the heat exchanging amount. It is formed from a second heat exchange section that does not have a means for adjusting, and the operation of the fan is selected according to the operation mode of both flow paths or refrigeration cycles, so it is possible to always perform an operation that reduces energy. . The refrigerating and air-conditioning apparatus of the present invention further includes a first heat exchange unit and a second heat exchange unit in series, and a heat exchange unit bypass circuit that bypasses at least one of the first and second heat exchange units. Therefore, it is always possible to operate with reduced energy.

  In the refrigerating and air-conditioning apparatus of the present invention, since the check valve or the on-off valve is provided in the heat exchange unit bypass circuit, it is possible to prevent wasteful refrigerating cycle heat exchange operation.

  The operation method of the refrigerating and air-conditioning apparatus of the present invention includes a first heat exchanger that is provided in a first refrigeration cycle in which refrigerant is circulated and performs indoor air conditioning, and a first refrigeration cycle in which a second refrigerant is circulated. And a second heat exchanger that is provided in a second refrigeration cycle independent of each other and performs refrigeration or freezing, and a refrigerant that passes through the first refrigeration cycle exchanges heat with a second refrigerant that passes through the flow path of the second refrigeration cycle. An operation in which a compressor is provided in the third heat exchanger, the first refrigeration cycle and the second refrigeration cycle, and the first and second refrigeration cycles are operated by adjusting at least the rotational speed of the compressor In a refrigeration air conditioner equipped with a situation adjustment means, adjusting the operation situation adjustment means to perform air conditioning operation in the first refrigeration cycle, and performing refrigeration or refrigeration operation in the second refrigeration cycle; Third heat exchanger fan Adjusting the amount of heat exchange of the third heat exchanger by the process, and bypassing part or all of the second refrigerant provided in the second refrigeration cycle to the third heat exchanger; And adjusting at least one of the adjustment of the operating condition adjusting means and the adjustment and bypassing of the heat exchange amount of the third heat exchanger so as to reduce the compression ratio of both the first and second refrigeration cycles. Since it is selected, efficient operation is possible at any time.

  As described above, the refrigerating and air-conditioning apparatus of the present invention attaches and disassembles the pipe connection portion of the third heat exchanger so that the refrigerating and refrigerating cycle apparatus, the air-conditioning side refrigerating cycle apparatus, and the refrigerating cycle between the two As a third heat exchanger that can exchange heat, it can be freely combined, so the installation space can be handled flexibly as an outdoor unit for refrigeration cycles connected to air conditioner indoor units or showcases placed indoors. Yes, the installation space can be reduced, or each can be placed in a convenient location. In addition, an apparatus that can reduce the energy at a low cost with an apparatus with a simple increase in the number of items can be obtained. In addition, the present invention is not limited to what operating conditions, air conditioning changes the temperature setting such as the season or the temperature of the outside air, or the compressor is always operated at a constant speed. It can be easily adapted to change according to the setting or to always operate the compressor at a constant speed, etc. Also, it is possible to add or change the air conditioning indoor unit, any combination on the refrigeration unit side Expansion and modification can be applied, and outdoor devices can be easily added. Furthermore, a refrigerating and air-conditioning apparatus capable of operating without waste of energy and a method thereof can be obtained. As described above, the present invention provides an easy-to-use apparatus such as flexible equipment change, and can perform an operation method with less energy for any situation.

  The present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant, A third heat exchanger in which the refrigerant passing through the independent flow paths of the first flow path connected to the heat exchanger and the second flow path connected to the second heat exchanger can exchange heat with each other. And a bypass channel that is provided in the second channel and that can adjust the amount of the second refrigerant flowing to the third heat exchanger, so that the bypass channel can be used in the entire refrigeration air conditioner. Energy reduction can be easily obtained without using it.

  The present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant, A plurality of third heats that can exchange heat with each other through the independent flow paths of the first flow path connected to the heat exchanger and the second flow path connected to the second heat exchanger. And a bypass flow path that is connected to the first flow path or the second flow path and bypasses the refrigerant with respect to at least one of the plurality of third heat exchangers. It is possible to obtain a refrigeration air conditioner that can easily reduce energy by switching the third heat exchanger according to the operating state.

  The present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant, A first flow path having a first compressor connected to the heat exchanger and a second flow path having a second compressor connected to the second heat exchanger. A third heat exchanger capable of exchanging heat with each other, and a blower for adjusting the amount of heat exchange between the third heat exchanger and ambient air, and a predetermined amount by driving the first compressor While performing the specified refrigeration or refrigeration operation by driving the air-conditioning operation and the second compressor, and changing the blower air volume in the direction to reduce both compressor inputs, the refrigeration air-conditioning device that can easily reduce energy Can be obtained.

  The present invention includes a first heat exchanger that performs heat exchange between air at normal temperature and the first refrigerant, a second heat exchanger that performs heat exchange between low-temperature air and the second refrigerant, The third heat in which the refrigerant passing through the independent flow paths of the first flow path connected to the heat exchanger and the second flow path connected to the second heat exchanger can exchange heat directly with each other. An auxiliary heat exchanger having a blower that is connected to at least one of the first flow path and the second flow path and is provided in parallel with the third heat exchanger and adjusts the amount of heat exchange with ambient air Therefore, the third heat exchanger can have a simple structure in which the heat can be directly transferred to the refrigerant that can transfer heat directly to the third heat exchanger, and a refrigeration air conditioner that can reduce energy is obtained. I can do it.

  The third heat exchanger of the present invention is formed of a plurality of heat exchange units, and the plurality of heat exchange units are arranged in parallel, in series, or in a switchable manner with respect to the refrigerant that passes through the independent flow paths, so that the flexible An easy-to-use refrigeration air conditioner that can be used in various ways is obtained.

  In the present invention, the third heat exchanger is formed of a first heat exchange unit capable of adjusting a heat exchange amount and a second heat exchange unit which does not adjust the heat exchange amount. Since the section and the second heat exchange section are arranged in parallel, in series, or switchable with respect to the refrigerant flow, a refrigeration air conditioner with a large energy reduction can be obtained with a simple configuration.

  In the present invention, since at least one of the plurality of heat exchanging parts forming the third heat exchanger is provided with a bypass flow path for bypassing the refrigerant flowing through the heat exchanging part, the refrigeration having a large energy reduction with a simple configuration is provided. An air conditioner is obtained.

  The present invention provides a plurality of heat exchange units forming a third heat exchanger, wherein the first refrigerant flows or is bypassed to the heat exchange unit connected to the first refrigeration cycle. Since the bypass flow path is provided and the heat exchanger that can adjust the heat exchange amount is bypassed during operation of the compressor that discharges the second refrigerant, a highly reliable refrigeration air conditioner with a simple configuration can be obtained.

  The present invention provides a plurality of heat exchange units forming a third heat exchanger, wherein the first refrigerant flows or is bypassed to the heat exchange unit connected to the first refrigeration cycle. Since the bypass channel is provided and the heat exchanging unit that does not adjust the heat exchanging amount is bypassed while the compressor that discharges the second refrigerant is stopped, a refrigeration air conditioner with high energy saving effect can be obtained.

  The present invention provides a plurality of heat exchange units forming a third heat exchanger, wherein the first refrigerant flows or bypasses the flowing refrigerant to the heat exchange unit connected to the first refrigeration cycle. A bypass flow path is provided so that the liquid refrigerant is not sucked into the compressor that sucks the first refrigerant when the compressor that discharges the second refrigerant is switched or the bypass flow path is switched according to operation. Since the liquid back protection means for delaying the change of the refrigerant is provided, a refrigeration air conditioner with high reliability and low energy consumption can be obtained.

  The third heat exchanger of the present invention is provided with a first heat exchange unit that has a blower and adjusts the heat exchange amount by changing the air volume that has been changed in speed from the stop of rotation, and means for adjusting the heat exchange amount. Since it is formed from the second heat exchanging section and the operation of the blower is selected in accordance with both flow paths or the operation mode of the refrigeration cycle, a refrigeration air conditioner with a simple structure and less energy can be obtained.

  The present invention includes an air-cooled integrated heat exchanger that adjusts the amount of heat exchange with ambient air by a blower and a refrigerant-refrigerant integrated heat exchanger that mainly performs heat exchange between the first refrigerant and the second refrigerant. Alternatively, a third heat exchanger is formed so that it can be connected in series or switched, and is described as a refrigerant refrigerant integrated heat exchanger between the first heat exchanger of the first flow path and the refrigerant refrigerant integrated heat exchanger. Since it is provided between the air-cooled integrated heat exchanger and the expansion means for expanding the first refrigerant, an easy-to-use refrigeration air conditioner capable of various operations can be obtained.

  The third heat exchanger of the present invention has a first flow path provided in the second flow path, or has the second flow path and the first flow path as plate-shaped paths on both sides. Alternatively, since the heat transfer tube forming the flow path has the radiation fins, a refrigerating and air-conditioning apparatus that can be configured according to the use and capacity of the apparatus is obtained.

  The present invention provides a first heat exchanger that is provided in a first refrigeration cycle in which refrigerant is circulated and performs indoor air conditioning, and a second refrigeration independent of the first refrigeration cycle in which a second refrigerant is circulated. A second heat exchanger provided in the cycle for refrigeration or freezing, and a third heat exchanger for exchanging heat between the refrigerant passing through the first refrigeration cycle and the second refrigerant passing through the flow path of the second refrigeration cycle And operating condition adjusting means for providing a compressor or the like in the first refrigeration cycle and the second refrigeration cycle and performing the operation of the first and second refrigeration cycles by turning on or off at least the compressor or adjusting the rotational speed. And a step of adjusting the operating condition adjusting means to perform air conditioning operation in the first refrigeration cycle and performing refrigeration or freezing operation in the second refrigeration cycle, Installed in the heat exchanger Adjusting the amount of heat exchange of the third heat exchanger by a fan, and bypassing the refrigerant to the third heat exchanger provided in the second refrigeration cycle or circulating the refrigerant to the second refrigeration cycle And a step of continuing refrigeration or freezing by stopping for a short time, so that an operation method of the refrigerating and air-conditioning apparatus having a large energy reduction effect can be obtained by a simple method.

  The present invention provides a first heat exchanger that is provided in a first refrigeration cycle in which a first refrigerant is circulated and performs indoor air conditioning, and a first refrigeration cycle that is independent of a first refrigeration cycle in which a second refrigerant is circulated. A second heat exchanger provided in the second refrigeration cycle for refrigeration or freezing, and the first refrigerant passing through the first refrigeration cycle exchanges heat with the second refrigerant passing through the flow path of the second refrigeration cycle. In addition, an air-cooled integrated heat exchanger that adjusts the amount of heat exchange with ambient air by a blower and a refrigerant-refrigerant integrated heat exchanger that mainly performs direct heat exchange between the first refrigerant and the second refrigerant, or A step of performing air conditioning operation in the first refrigeration cycle and refrigeration or refrigeration operation in the second refrigeration cycle for a refrigeration air conditioner including a third heat exchanger that can be connected in series or switched And cooling for the first refrigeration cycle Is equipped with a step that operates mainly on an air-cooled integrated heat exchanger and mainly operates on a refrigerant-refrigerant integrated heat exchanger during heating. A driving method is obtained.

  The present invention provides a first heat exchanger that is provided in a first refrigeration cycle in which a first refrigerant is circulated and performs indoor air conditioning, and a first refrigeration cycle that is independent of a first refrigeration cycle in which a second refrigerant is circulated. A second heat exchanger provided in the second refrigeration cycle for refrigeration or freezing, and the first refrigerant passing through the first refrigeration cycle exchanges heat with the second refrigerant passing through the flow path of the second refrigeration cycle. The third heat exchanger, the air-cooled integrated heat exchanger that adjusts the amount of heat exchange with the ambient air by a blower, and the refrigerant-refrigerant integrated type that mainly performs direct heat exchange between the first refrigerant and the second refrigerant A third heat exchanger that can be connected in series with the heat exchanger, and an opening / closing means that is provided in the first refrigeration cycle and switches a flow path between the refrigerant refrigerant integrated heat exchanger and the air cooling integrated heat exchanger, Air conditioning operation in the first refrigeration cycle A step of performing refrigeration or refrigeration operation in the second refrigeration cycle, a step of opening and closing the opening / closing means and causing the first refrigerant to flow into the refrigerant-refrigerant integrated heat exchanger and not into the air-cooled integrated heat exchanger. The air-cooled integrated heat exchanger includes a step of flowing only the second refrigerant, so that a method for operating the refrigeration air conditioner that uses less energy can be obtained.

  The present invention allows heat transfer between the air-conditioning side and the refrigeration or freezing side in the air-cooling integrated heat exchanger during heating air-conditioning, and refrigeration or cooling between the air-conditioning side and the refrigerant refrigerant-integrated heat exchanger during cooling air-conditioning. Since heat transfer is performed between the refrigeration side, a method for operating the refrigeration air conditioner having a large energy reduction effect can be obtained.

  The present invention provides at least one of adjusting the operating condition adjusting means and adjusting the heat exchange amount of the third heat exchanger so as to reduce the compression ratio of both the first and second refrigeration cycles. Therefore, it is possible to obtain an easy-to-use method for operating a refrigeration air conditioner.

1 is a connection diagram of an air conditioner / refrigerator in a store such as a convenience store showing an example of an embodiment of the present invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The Mollier diagram which shows operation | movement of the refrigerating air conditioner which shows an example of embodiment of this invention. Structure explanatory drawing of the integrated heat exchanger which shows an example of embodiment of this invention. Structure explanatory drawing of the integrated heat exchanger which shows an example of embodiment of this invention. Structure explanatory drawing of the integrated heat exchanger which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The flowchart which shows operation | movement of the refrigerating air conditioner which shows an example of embodiment of this invention. The flowchart which shows operation | movement of the refrigerating air conditioner which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. Structure explanatory drawing of the integrated heat exchanger which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. The flowchart which shows operation | movement of the refrigerating air conditioner which shows an example of embodiment of this invention. The flowchart which shows operation | movement of the refrigerating air conditioner which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention. Structure explanatory drawing of the integrated heat exchanger which shows an example of embodiment of this invention. The refrigeration air-conditioning apparatus block diagram which shows an example of embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Air-conditioning outdoor unit, 11 Refrigeration air-conditioning integrated machine, 12a Air-conditioning indoor unit connected with refrigeration air-conditioning integrated machine 11, 12b Air-conditioning indoor unit connected with air-conditioning outdoor unit 10, 13 Refrigeration or freezing showcase 14 stores, 21a compressor for air conditioning, 21b compressor for refrigeration or freezing, 22a indoor heat exchanger for air conditioning, 22b indoor heat exchanger for refrigeration or freezing, 22c heat exchanger for supercooling, 22d for refrigeration or Sub heat exchanger for refrigeration, 22e Sub heat exchanger for air conditioning, 23a Expansion means for air conditioning, 23b Expansion means for refrigeration or freezing, 23c Expansion means for supercooling, 24a Flow path for air conditioning, 24b Flow for refrigeration or freezing Path, 24c bypass flow path, 24d supercooling refrigerant flow path, 25a air conditioning indoor heat exchanger fan, 25b refrigeration or freezing heat exchange Fan, 25c Integrated heat exchanger blower fan, 25d Refrigeration or refrigeration sub heat exchanger, 22d blower fan, 25e Air conditioning sub heat exchanger 22e blower fan, 26 Liquid reservoir, 31 Four-way flow Path switching means, 32 high pressure maintaining means or flow path control means, 33 supercooling means, 34 integral heat AC path switching means, 35 check valve, 36 heat source side connection valve, 37 load side connection valve, 41 for integrated heat exchanger Radiation fin, 42 Integrated heat exchanger, 51 Indoor air temperature detection means, 52 Air conditioning side heat exchanger temperature detection means or pressure detection means, 53 Air conditioning side discharge temperature detection means, 54 Air conditioning side indoor saturation temperature detection means, 55 Air conditioning Side liquid pipe temperature detection means, 56 Air-conditioning side two-phase pipe temperature detection means, 57 Outside air temperature detection means, 61 Refrigeration Low pressure detection means or evaporation temperature detection means or ambient temperature detection means for a refrigeration or freezing indoor heat exchanger, 62 refrigeration side condensation temperature detection means or high pressure detection means, 63 refrigeration side discharge temperature detection means, 64 internal temperature detection means 71 Capillaries as first throttling means, 72 Capillaries as second throttling means, 73 Air-conditioning side flow path switching on-off valve, 74 Air-conditioning side flow path switching on-off valve, 75 On-off valve, 76 Refrigeration side or refrigeration On-off valve for high-pressure side maintenance, 77 On-off valve for high-pressure maintenance on the refrigeration side or refrigeration side, 78 On-off valve, 79 Medium-pressure receiver, 80 On-off valve on refrigeration or refrigeration load side

Claims (14)

A first heat exchanger for exchanging heat between normal temperature air and the first refrigerant; a second heat exchanger for exchanging heat between low temperature air and the second refrigerant; and the first heat exchange. refrigerant through the first flow path and having a respective flow paths each, independently of the second flow path connected the to the second heat exchanger that each flow path being connected to heat exchange with each other in the vessel A second heat exchanger connected integrally with the second heat exchanger and a second flow path of the third heat exchanger to circulate the second refrigerant. A bypass flow path that is provided in the refrigeration cycle and that allows a part or all of the second refrigerant to bypass the third heat exchanger, and a refrigerant flow rate that is connected to the bypass flow path and flows to the bypass flow path is adjusted. And a mixed refrigerant containing gas refrigerant from the second flow path and the bypass flow path of the third heat exchanger. Refrigerating and air-conditioning apparatus characterized by comprising: a supercooling means provided in the second refrigeration cycle for storing liquefied to liquid reservoir in supercooling heat exchanger, a. A first heat exchanger for exchanging heat between normal temperature air and the first refrigerant; a second heat exchanger for exchanging heat between low temperature air and the second refrigerant; and the first heat exchange. refrigerant through the first flow path and having a respective flow paths each, independently of the second flow path connected the to the second heat exchanger that each flow path being connected to heat exchange with each other in the vessel And connecting the first heat exchanger integrated with the first heat exchanger and the first flow path of the third heat exchanger with a pipe, and using the first compressor The first refrigeration cycle for circulating the first refrigerant, the second heat exchanger, and the second flow path of the third heat exchanger are connected by a pipe, and the second compressor A second refrigeration cycle for circulating the second refrigerant, and an evaporation temperature of the first refrigerant when evaporating the first refrigerant in the first flow path of the third heat exchanger; in front Characterized in that close to the condensation temperature of the second coolant flowing in the third heat exchanger to the first refrigerant heat exchanger reduces the air volume of the blower fan for blowing air to the third heat exchanger Refrigeration air conditioner. In the first compressor and the second refrigeration cycle provided in the first refrigeration cycle by reducing the air volume of the blower fan that blows air to the third heat exchanger, or by stopping the blowing of the blower fan 3. The refrigeration according to claim 1, wherein the air volume of the blower fan is adjusted in a direction to reduce a compression ratio, which is a ratio between a high pressure and a low pressure, of at least one of the second compressors provided. Air conditioner. While performing a predetermined air-conditioning operation by driving the first compressor and a predetermined refrigeration or freezing operation by driving the second compressor, the blower in a direction to reduce the total value of both compressor inputs. The refrigerating and air-conditioning apparatus according to claim 3, wherein the air blowing amount is changed . A flow path control means for adjusting a flow rate of refrigerant that is connected to the second refrigeration cycle and flows a part or all of the second refrigerant to a bypass flow path that can bypass the third heat exchanger; When evaporating the first refrigerant in the first flow path of the third heat exchanger, the second heat exchanger reduces the amount of heat of condensation of the second refrigerant that exchanges heat with the first refrigerant. The amount of said 2nd refrigerant | coolant which flows into this flow path is adjusted with said flow path control means, and the differential pressure | voltage of the expansion means provided in said 2nd refrigeration cycle is ensured. The refrigeration air conditioner according to 2 or 3 . Auxiliary heat exchange having a blower connected to the second flow path of the third heat exchanger and provided in the bypass flow path in parallel with the third heat exchanger to adjust the amount of heat exchange with ambient air A refrigerating and air-conditioning apparatus according to claim 5, further comprising: An auxiliary heat exchanger having a blower connected to the first flow path of the third heat exchanger and provided in parallel with the third heat exchanger to adjust the amount of heat exchange with ambient air. refrigeration and air conditioning apparatus according to any one of claims 1 to 6, characterized in that the. Connected to a room in which a plurality of air conditioning indoor units and a refrigeration unit are disposed, and a first refrigeration cycle provided in at least one of the air conditioning indoor units disposed in the room to circulate a first refrigerant. A first heat exchanger that exchanges heat between the air and the first refrigerant, and a second refrigeration cycle that is provided in the refrigeration apparatus and circulates the second refrigerant, and is connected to the low-temperature air and the second refrigerant A second heat exchanger that performs heat exchange with the refrigerant, and the first refrigeration cycle and the first refrigeration cycle, and the first and A third heat exchanger provided integrally so that the second refrigerant exchanges heat without mixing with each other, and a part or all of the second refrigerant can bypass the third heat exchanger. Flow to the bypass flow path provided in the second refrigeration cycle A flow path control means for adjusting a refrigerant flow rate, another heat exchanger provided in another air conditioning indoor unit among the plurality of air conditioning indoor units arranged in the room, and a heat source unit arranged outside the room A third refrigeration cycle for circulating a third refrigerant between them, and when cooling the room, priority is given to the operation of the third refrigeration cycle that does not exchange heat with the third heat exchanger, A refrigeration air conditioner characterized in that priority is given to the operation of the first refrigeration cycle for exchanging heat with the third heat exchanger when the room is heated . The room temperature target temperature set in the other air conditioning indoor unit during the cooling operation is set lower than the room temperature target temperature set in the air conditioning indoor unit, and the room temperature set in the air conditioning indoor unit during the heating operation is set. The refrigerating and air-conditioning apparatus according to claim 8, wherein the target temperature is set higher than a target temperature of room temperature set in the other indoor unit for air conditioning. The blower fan with respect to the first flow path connected to the first refrigeration cycle and the second flow path connected to the second refrigeration cycle provided integrally with the third heat exchanger The refrigerating and air-conditioning apparatus according to any one of claims 1 to 9, wherein the air is sent from the second flow path side to the first flow path side . The first flow path connected to the first refrigeration cycle and the second flow path connected to the second refrigeration cycle, which are provided integrally with the third heat exchanger, are used during cooling operation. The refrigerating and air-conditioning apparatus according to any one of claims 1 to 9, wherein one inlet side is set to the other outlet side so that both condensation heats do not overlap each other . Provided in a first refrigeration cycle that is provided in a first refrigeration cycle in which refrigerant is circulated and performs indoor air conditioning, and in a second refrigeration cycle that is independent of the first refrigeration cycle in which second refrigerant is circulated. A second heat exchanger that performs refrigeration or freezing, and a third heat exchanger that exchanges heat between the refrigerant passing through the first refrigeration cycle and the second refrigerant passing through the flow path of the second refrigeration cycle. A compressor or the like is provided in each of the first refrigeration cycle and the second refrigeration cycle, and the operation of the first and second refrigeration cycles is performed by turning on or off at least the compressor or adjusting the rotation speed. An operating condition adjusting means for performing the heating operation in the first refrigeration cycle by adjusting the operating condition adjusting means, and refrigeration or freezing in the second refrigeration cycle. luck Adjusting the air volume by adjusting the air volume with a blower provided in the third heat exchanger, adjusting the heat exchange amount of the third heat exchanger, and providing the second refrigeration cycle with the first Adjusting the flow rate of the bypass circuit for bypassing the third heat exchanger to reduce the amount of refrigerant flowing to the third heat exchanger or to stop the cooling heat for a short time to continue refrigeration or freezing. A method of operating a refrigeration air conditioner characterized by the above. Adjusting the operating condition adjusting means and adjusting the heat exchange amount of the third heat exchanger so as to reduce the compression ratio of both the compressors provided in the first and second refrigeration cycles. The operation method of the refrigerating and air-conditioning apparatus according to claim 12, wherein at least one of them is selected . 14. The refrigerating and air-conditioning apparatus according to claim 12 or 13, wherein the flow rate of the bypass circuit is adjusted after the indoor fan is heated or lowered or stopped from a blower provided in the third heat exchanger. how to drive.

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